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Societal collapse

Societal collapse (also known as civilizational collapse) is the fall of a complex human society characterized by the loss of cultural identity and of socioeconomic complexity, the downfall of government, and the rise of violence. Possible causes of a societal collapse include natural catastrophe, war, pestilence, famine, population decline, and mass migration. A collapsed society may revert to a more primitive state (Dark Ages), be absorbed into a stronger society, or completely disappear.

Destruction, from The Course of Empire by Thomas Cole (1836)
Desolation, from The Course of Empire by Thomas Cole (1836)

Virtually all civilizations have suffered such a fate, regardless of their size or complexity, but some of them later revived and transformed, such as China, India, and Egypt. However, others never recovered, such as the Western and Eastern Roman Empires, the Mayan civilization, and the Easter Island civilization. Societal collapse is generally quick but rarely abrupt. However, some cases involve not a collapse but only a gradual fading away, such as the British Empire since 1918.

Anthropologists, (quantitative) historians, and sociologists have proposed a variety of explanations for the collapse of civilizations involving causative factors such as environmental change, depletion of resources, unsustainable complexity, invasion, disease, decay of social cohesion, rising inequality, secular decline of cognitive abilities, loss of creativity, and misfortune. However, complete extinction of a culture is not inevitable, and in some cases, the new societies that arise from the ashes of the old one are evidently its offspring, despite a dramatic reduction in sophistication. Moreover, the influence of a collapsed society, such as the Western Roman Empire, may linger on long after its death.

The study of societal collapse, collapsology, is a topic for specialists of history, anthropology, sociology, and political science. More recently, they are joined by experts in cliodynamics and study of complex systems.

Contents

Joseph Tainter frames societal collapse in his The Collapse of Complex Societies (1988), which is a seminal and founding work of the academic discipline on societal collapse. He elaborates that 'collapse' is a "broad term," but in the sense of societal collapse, he views it as "a political process." He further narrows societal collapse as a rapid process (within "few decades") of "substantial loss of sociopolitical structure," giving the fall of the Western Roman Empire as "the most widely known instance of collapse" in the Western world.

Others, particularly in response to the popular Collapse (2005) by Jared Diamond and more recently, have argued that societies discussed as cases of collapse are better understood through resilience and societal transformation, or "reorganization", especially if collapse is understood as a "complete end" of political systems, which according to Shmuel Eisenstadt has not taken place at any point. Eisenstadt also points out that a clear differentiation between total or partial decline and "possibilities of regeneration" is crucial for the preventive purpose of the study of societal collapse.

The social scientist Luke Kemp analyzed dozens of civilizations, which he defined as "a society with agriculture, multiple cities, military dominance in its geographical region and a continuous political structure," from 3000 BC to 600 AD and calculated that the average life span of a civilization is close to 340 years. Of them, the most durable were the Kushite Kingdom in Northeast Africa (1,150 years), the Aksumite Empire in Africa (1,100 years), and the Vedic civilization in South Asia and the Olmecs in Mesoamerica (both 1,000 years), and the shortest-lived were the Nanda Empire in India (24) and the Qin Dynasty in China (14).

A statistical analysis of empires by complex systems specialist Samuel Arbesman suggests that collapse is generally a random event and does not depend on age. That is analogous to what evolutionary biologists call the Red Queen hypothesis, which asserts that for a species in a harsh ecology, extinction is a persistent possibility.

Contemporary discussions about societal collapse are seeking resilience by suggesting societal transformation.

Because human societies are complex systems, common factors may contribute to their decline that are economical, environmental, demographic, social and cultural, and they may cascade into another and build up to the point that could overwhelm any mechanisms that would otherwise maintain stability. Unexpected and abrupt changes, which experts call nonlinearities, are some of the warnings signs. In some cases a natural disaster (e.g. tsunami, earthquake, pandemic, massive fire or climate change), may precipitate a collapse. Other factors such as a Malthusian catastrophe, overpopulation, or resource depletion might be contributory factors of collapse, but studies of past societies seem to suggest that they did not cause the collapse alone. Significant inequity and exposed corruption may combine with lack of loyalty to established political institutions and result in an oppressed lower class rising up and seizing power from a smaller wealthy elite in a revolution. The diversity of forms that societies evolve corresponds to diversity in their failures. Jared Diamond suggests that societies have also collapsed through deforestation, loss of soil fertility, restrictions of trade and/or rising endemic violence.

Any society has periods of prosperity and hardship, but when decline from the height of civilization is that dramatic, one can safely say that it has collapsed. However, in the case of the Western Roman Empire, some argued that it did not collapse but merely transformed.

Natural disasters and climate change

Main article: Climate apocalypse
The Indus Valley Civilization likely declined because of a long-lasting drought.

Archeologists identified signs of a megadrought for a millennium between 5,000 and 4,000 years ago in Africa and Asia. The drying of the Green Sahara not only turned it into a desert but also disrupted the monsoon seasons in South and Southeast Asia and caused flooding in East Asia, which prevented successful harvest and the development of complex culture. It coincided with and may have caused the decline and the fall of the Akkadian Empire in Mesopotamia and the Indus Valley Civilization. The dramatic shift in climate is known as the 4.2 kiloyear event.

The highly-advanced Indus Valley Civilization took roots around 3000 BC in what is now northwestern India and Pakistan and collapsed around 1700 BC. Since the Indus script has yet to be deciphered, the causes of its demise remain a mystery, but there is some evidence pointing to natural disasters. Signs of a gradual decline began to emerge in 1900 BC, and two centuries later, most of the cities had been abandoned. Archeological evidence suggests an increase in interpersonal violence and in infectious diseases like leprosy and tuberculosis. Historians and archeologists believe that severe and long-lasting drought and a decline in trade with Egypt and Mesopotamia caused the collapse. Evidence for earthquakes has also been discovered. Sea level changes are also found at two possible seaport sites along the Makran coast which are now inland. Earthquakes may have contributed to decline of several sites by direct shaking damage or by changes in sea level or in water supply.

Volcanic eruptions can abruptly influence the climate. During a large eruption, sulfur dioxide (SO2) is expelled into the stratosphere, where it could stay for years and gradually get oxidized into sulfate aerosols. Being highly reflective, sulfate aerosols reduce the incident sunlight and cool the Earth's surface. By drilling into glaciers and ice sheets, scientists can access the archives of the history of atmospheric composition. A team of multidisciplinary researchers led by Joseph McConnell of the Desert Research Institute in Reno, Nevada deduced that a volcanic eruption occurred in 43 BC, a year after the assassination of Julius Caesar on the Ides of March (March 15) in 44 BC, which left a power vacuum and led to bloody civil wars. According to historical accounts, it was also a period of poor weather, crop failure, widespread famine, and disease. Analyses of tree rings and cave stalagmites from different parts of the globe provided complementary data. The Northern Hemisphere got drier, but the Southern Hemisphere became wetter. Indeed, the Greek historian Appian recorded that there was a lack of flooding in Egypt, which also faced famine and pestilence. Rome's interest in Egypt as a source of food intensified, and the aforementioned problems and civil unrest weakened Egypt's ability to resist. Egypt came under Roman rule after Cleopatra committed suicide in 30 BC. While it is difficult to say for certain whether Egypt would have become a Roman province if Okmok volcano (in modern-day Alaska) had not erupted, the eruption likely hastened the process.

Global average temperatures show that the Little Ice Age was not a distinct global time period but the end of a long temperature decline, which preceded the recent global warming.

More generally, recent research pointed to climate change as a key player in the decline and fall of historical societies in China, the Middle East, Europe, and the Americas. In fact, paleoclimatogical temperature reconstruction suggests that historical periods of social unrest, societal collapse, and population crash and significant climate change often occurred simultaneously. A team of researchers from Mainland China and Hong Kong were able to establish a causal connection between climate change and large-scale human crises in pre-industrial times. Short-term crises may be caused by social problems, but climate change was the ultimate cause of major crises, starting with economic depressions. Moreover, since agriculture is highly dependent on climate, any changes to the regional climate from the optimum can induce crop failures.

The Mongol conquests corresponded to a period of cooling in the Northern Hemisphere between the thirteenth and fourteenth centuries, when the Medieval Warm Period was giving way to the Little Ice Age, which caused ecological stress. In Europe, the cooling climate did not directly facilitate the Black Death, but it caused wars, mass migration, and famine, which helped diseases spread.

The Thirty Years' War devastated much of Europe and was one of the many political upheavals during the General Crisis of the Seventeenth Century, which is causally linked to the Little Ice Age.

A more recent example is the General Crisis of the Seventeenth Century in Europe, which was a period of inclement weather, crop failure, economic hardship, extreme intergroup violence, and high mortality because of the Little Ice Age. The Maunder Minimum involved sunspots being exceedingly rare. Episodes of social instability track the cooling with a time lap of up to 15 years, and many developed into armed conflicts, such as the Thirty Years' War (1618–1648), which started as a war of succession to the Bohemian throne. Animosity between Protestants and Catholics in the Holy Roman Empire (in modern-day Germany) added fuel to the fire. Soon, it escalated to a huge conflict that involved all major European powers and devastated much of Germany. When the war had ended, some regions of the empire had seen their populations drop by as much as 70%. However, not all societies faced crises during this period. Tropical countries with high carrying capacities and trading economies did not suffer much because the changing climate did not induce an economic depression in those places. Moreover, by the mid-eighteenth century, as global temperatures started to rise, the ecological stress faced by Europeans also began to fade. Mortality rates dropped and the level of violence fell, which paved the way for the Pax Britannica, a period that witnessed the emergence of a variety of innovations in technology (which enabled industrialization), medicine (which improved hygiene), and social welfare (such as the world's first welfare programs in Germany), making life even more comfortable.

Foreign invasions and mass migration

See also: Bond event
Map of the Late Bronze Age Collapse (ca 1200 BC) in the Eastern Mediterranean

A mysterious loose confederation of fierce maritime marauders, known as the Sea Peoples, was identified as one of the main causes of the Late Bronze Age collapse in the Eastern Mediterranean. The Sea Peoples might have themselves been victims of the environmental changes that led to widespread famine and precipitated the Collapse. After the Battle of Kadesh against the Egyptians in 1285 BC, the Hittite Empire began to show signs of decline. Attacks by the Sea Peoples accelerated the process, and internal power struggles, crop failures, and famine were contributory factors. The Egyptians, with whom the Hittites signed a peace treaty, supplied them with food in times of famine, but it was not enough. Around 1200 BC, the Sea Peoples seized a port on the west coast of Asia Minor, cutting off the Hittites from their trade routes from which their supply of grain came. Hattusa, the Hittite capital, was destroyed. Some Hittite territories survived but would be were eventually occupied by the Assyrians in the seventh century BC.

The Minoan Civilization, based on Crete, centered on religious rituals and seaborne trade. In around 1450 BC, it was absorbed into Mycenaean Greece, which itself went into serious decline around 1200 BC because of various military conflicts, including the Dorian invasion from the north and attacks from the Sea Peoples.

Barbarian invasions played an important role in the fall of the Western Roman Empire.

In the third century BC, a Eurasian nomadic people, the Xiongnu, began threatening China's frontiers, but by the first century BC, they had been completely expelled. They then turned their attention westward and displaced various other tribes in Eastern and Central Europe, which led to a cascade of events. Attila rose to power as leader of the Huns and initiated a campaign of invasions and looting and went as far as Gaul (modern-day France). Attila's Huns were clashing with the Roman Empire, which had already been divided into two halves for ease of administration: the Eastern Roman Empire and the Western Roman Empire. Despite their decisive victory at the Battle of Chalons in 451 AD, the Romans were unable to stop Attila from attacking Roman Italy. Northern Italian cities like Milan were ravaged. The Huns never again posed a threat to the Romans after Attila's death, but the rise of the Huns also forced the Germanic peoples out of their territories and made those groups press their way into parts of France, Spain, Italy, and even as far south as North Africa. The city of Rome itself came under attack by the Visigoths in 410 and was plundered by the Vandals in 455. A combination of internal strife, economic weakness, and relentless invasions by the Germanic peoples pushed the Western Roman Empire into terminal decline. The last Western Roman Emperor, Romulus Augustulus, was dethroned in 476 by the German Odoacer, who declared himself King of Italy.

In the eleventh century AD, North Africa's populous and flourishing civilization collapsed after it had exhausted its resources in internal fighting and suffering devastation from the invasion of the Bedouin tribes of Banu Sulaym and Banu Hilal. Ibn Khaldun noted that all of the lands ravaged by Banu Hilal invaders had become arid desert.

Vietnam under Emperor Minh Mạng, superimposed on modern political maps.

In 1206, a warlord achieved dominance over all Mongols with the title Genghis Khan and began his campaign of territorial expansion. The Mongols' highly flexible and mobile cavalry enabled them to conquer their enemies with efficiency and swiftness. In the brutal pillaging that followed Mongol invasions during the thirteenth and fourteenth centuries, the invaders decimated the populations of China, Russia, the Middle East, and Islamic Central Asia. Later Mongol leaders, such as Timur, destroyed many cities, slaughtered thousands of people, and irreparably damaged the ancient irrigation systems of Mesopotamia. The invasions transformed a settled society to a nomadic one. In China, for example, a combination of war, famine, and pestilence during the Mongol conquests halved the population, a decline of around 55 million people. The Mongols also displaced large numbers of people and created power vacuums. The Khmer Empire went into decline and was replaced by the Thais, who were pushed southward by the Mongols. The Vietnamese, who succeeded in defeating the Mongols, also turned their attention to the south and by 1471 began to subjugate the Chams. When Vietnam's Later Lê Dynasty went into decline in the late 1700s, a bloody civil war erupted between the Trịnh family in the north and the Nguyễn family in the south. More Cham provinces were seized by the Nguyễn warlords. Finally, Nguyễn Ánh emerged victorious and declared himself Emperor of Vietnam (changing the name from Annam) with the title Gia Long and established the Nguyễn Dynasty. The last remaining principality of Champa, Panduranga (modern-day Phan Rang, Vietnam), survived until 1832, when Emperor Minh Mạng (Nguyễn Phúc Đảm) conquered it after centuries of Cham–Vietnamese wars. Vietnam's policy of assimilation involved the forcefeeding of pork to Muslims and beef to Hindus, which fueled resentment. An uprising followed, the first and only war between Vietnam and the jihadists, until it was crushed.

Famine, economic depression, and internal strife

Around 1210 BC, the New Kingdom of Egypt shipped large amounts of grains to the disintegrating Hittite Empire. Thus, there had been a food shortage in Anatolia but not the Nile Valley. However, that soon changed. Although Egypt managed to deliver a decisive and final defeat to the Sea Peoples at the Battle of Xois, Egypt itself went into steep decline. The collapse of all other societies in the Eastern Mediterranean disrupted established trade routes and caused widespread economic depression. Government workers became underpaid, which resulted in the first labor strike in recorded history and undermined royal authority. There was also political infighting between different factions of government. Bad harvest from the reduced flooding at the Nile led to a major famine. Food prices rose to eight times their normal values and occasionally even reached twenty-four times. Runaway inflation followed. Attacks by the Libyans and Nubians made things even worse. Throughout the Twentieth Dynasty (∼1187–1064 BC), Egypt devolved from a major power in the Mediterranean to a deeply divided and weakened state, which later came to be ruled by the Libyans and the Nubians.

Between 481 BC and 221 BC, the Period of the Warring States in China ended by King Zheng of the Qin dynasty succeeding in defeating six competing factions and thus becoming the first Chinese emperor, titled Qin Shi Huang. A ruthless but efficient ruler, he raised a disciplined and professional army and introduced a significant number of reforms, such as unifying the language and creating a single currency and system of measurement. In addition, he funded dam constructions and began building the first segment of what was to become the Great Wall of China to defend his realm against northern nomads. Nevertheless, internal feuds and rebellions made his empire fall apart after his death in 210 B.C.

In the early fourteenth century AD, Britain suffered repeated rounds of crop failures from unusually heavy rainfall and flooding. Much livestock either starved or drowned. Food prices skyrocketed, and King Edward II attempted to rectify the situation by imposing price controls, but vendors simply refused to sell at such low prices. In any case, the act was abolished by the Lincoln Parliament in 1316. Soon, people from commoners to nobles were finding themselves short of food. Many resorted to begging, crime, and eating animals they otherwise would not eat. People in northern England had to deal with raids from Scotland. There were even reports of cannibalism.

In Continental Europe, things were at least just as bad. The Great Famine of 1315–1317 coincided with the end of the Medieval Warm Period and the start of the Little Ice Age. Some historians suspect that the change in climate was due to Mount Tarawera in New Zealand erupting in 1314. The Great Famine was, however, only one of the calamities striking Europe that century, as the Hundred Years' War and Black Death would soon follow. (Also see the Crisis of the Late Middle Ages.) Recent analysis of tree rings complement historical records and show that the summers of 1314–1316 were some of the wettest on record over a period of 700 years.

Disease outbreaks

The angel of death striking a door during the plague of Rome; engraving by Levasseur after Jules-Elie Delaunay (1828–1891).

Historically, the dawn of agriculture led to the rise of contagious diseases. Compared to their hunting-gathering counterparts, agrarian societies tended to be sedentary, have higher population densities, be in frequent contact with livestock, and be more exposed to contaminated water supplies and higher concentrations of garbage. Poor sanitation, a lack of medical knowledge, superstitions, and sometimes a combination of disasters exacerbated the problem. The journalist Michael Rosenwald wrote that "history shows that past pandemics have reshaped societies in profound ways. Hundreds of millions of people have died. Empires have fallen. Governments have cracked. Generations have been annihilated."

From the description of symptoms by the Greek physician Galen, which included coughing, fever, (blackish) diarrhea, swollen throat, and thirst, modern experts identified the probable culprits of the Antonine Plague (165–180 A5) to have been smallpox or measles. The disease likely started in China and spread to the West via the Silk Road. Roman troops first contracted the disease in the East before they returned home. Striking a virgin population, the Antonine Plague had dreadful mortality rates; between one third to half of the population, 60 to 70 million people, perished. Roman cities suffered from a combination of overcrowding, poor hygiene, and unhealthy diets. They quickly became epicenters. Soon, the disease reached as far as Gaul and mauled Roman defenses-along the Rhine. The ranks of the previously formidable Roman army had to be filled with freed slaves, German mercenaries, criminals, and gladiators. That ultimately failed to prevent the Germanic tribes from crossing the Rhine. On the civilian side, the Antonine Plague created drastic shortages of businessmen, which disrupted trade, and farmers, which led to a food crisis. An economic depression followed and government revenue fell. Some accused Emperor Marcus Aurelius and Co-Emperor Lucius Verus, both of whom victims of the disease, of affronting the gods, but others blamed Christians. However, the Antonine Plague strengthened the position of the monotheistic religion of Christianity in the formerly-polytheistic society, as Christians won public admiration for their good works. Ultimately the Roman army, the Roman cities, the size of the empire and its trade routes, which were required for Roman power and influence to exist, facilitated the spread of the disease. The Antonine Plague is considered by some historians as a useful starting point for understanding the decline and fall of the Western Roman Empire. It was followed by the Plague of Cyprian (249–262 AD) and the Plague of Justinian (541-542). Together, they cracked the foundations of the Roman Empire.

In the sixth century AD, while the Western Roman Empire had already succumbed to attacks by the Germanic tribes, the Eastern Roman Empire stood its ground. In fact, a peace treaty with the Persians allowed Emperor Justinian the Great to concentrate on recapturing territories belonging to the Western Empire. His generals, Belisarius and Narses, achieved a number of important victories against the Ostrogoths and the Vandals. However, their hope of keeping the Western Empire was dashed by the arrival of what became known as the Plague of Justinian (541-542). According to the Byzantine historian Procopius of Caesarea, the epidemic originated in China and Northeastern India and reached the Eastern Roman Empire via trade routes terminating in the Mediterranean. Modern scholarship has deduced that the epidemic was caused by the bacterium Yersinia pestis, the same one that would later bring the Black Death, the single deadliest pandemic in human history, but how many actually died from it remains uncertain. Current estimates put the figure between thirty and fifty million people, a significant portion of the human population at that time. The Plague arguably cemented the fate of Rome.

The epidemic also devastated the Sasanian Empire in Persia. Caliph Abu Bakr seized the opportunity to launch military campaigns that overran the Sassanians and captured Roman-held territories in the Caucasus, the Levant, Egypt, and elsewhere in North Africa. Before the Justinian Plague, the Mediterranean world had been commercially and culturally stable. After the Plague, it fractured into a trio of civilizations battling for power: the Islamic Civilization, the Byzantine Empire, and what later became known as Medieval Europe. With so many people dead, the supply of workers, many of whom were slaves, was critically short. Landowners had no choice but to lend pieces of land to serfs to work the land in exchange for military protection and other privileges. That sowed the seeds of feudalism.

Spread of the Bubonic plague through Europe

There is evidence that the Mongol expeditions may have spread the bubonic plague across much of Eurasia, which helped to spark the Black Death of the early fourteenth century. The Italian historian Gabriele de’ Mussi wrote that the Mongols catapulted the corpses of those who contracted the plague into Caffa (now Feodossia, Crimea) during the siege of that city and that soldiers who were transported from there brought the plague to Mediterranean ports. However, that account of the origin of the Black Death in Europe remains controversial, though plausible, because of the complex epidemiology of the plague. Modern epidemiologists do not believe that the Black Death had a single source of spreading into Europe. Research into the past on this topic is further complicated by politics and the passage of time. It is difficult to distinguish between natural epidemics and biological warfare, both of which are common throughout human history. Biological weapons are economical because they turn an enemy casualty into a delivery system and so were favored in armed conflicts of the past. Furthermore, more soldiers died of disease than in combat until recently. In any case, by the 1340s, Europe faced a combination of overpopulation and famine. As a result, many had weakened immune systems, especially those living in squalid conditions. Whatever its origins, the Black Death killed around one third of the population in medieval Europe, or about 200 million people. The widening trade routes in the Late Middle Ages helped the plague spread rapidly. It took the European population more than two centuries to return to its level before the pandemic. Consequently, it destabilized most of society and likely undermined feudalism and the authority of the Church. In parts of England, for example, 80% of the population living in poverty were killed. Economic deprivation and war followed. In England and France, for example, a combination of the plague and the Hundred Years' War killed about half the population.

With labor in short supply, workers' bargaining power increased dramatically. Various inventions that reduced the cost of labor, saved time, and raised productivity, such as the three-field crop rotation system, the iron plow, the use of manure to fertilize the soil, and the water pumps, were widely adopted. Many former serfs, now free from feudal obligations, relocated to the cities and changed profession to crafts and trades. The more successful ones became the new middle class. Trade flourished as demands for a myriad of consumer goods rose. Society became wealthier and could afford to fund the arts and the sciences. The Black Death marked the end of the Middle Ages in Europe; the Renaissance had begun.

Aztec victims of smallpox, from the Florentine Codex (1540–85)

Encounters between European explorers and Native Americans exposed the latter to a variety of diseases of extraordinary virulence. Having migrated from Northeastern Asia 15,000 years ago, Native Americans had not been introduced to the plethora of contagious diseases that emerged after the rise of agriculture in the Old World. As such, they had immune systems that were ill-equipped to handle the diseases to which their counterparts in Eurasia had become resistant. When the Europeans arrived in the Americas, in short order, the indigenous populations of the Americas found themselves facing smallpox, measles, whooping cough, and the bubonic plague, among others. In tropical areas, malaria, yellow fever, dengue fever, river blindness, and others appeared. Most of these tropical diseases were traced to Africa. Smallpox ravaged Mexico in the 1520s and killed 150,000 in Tenochtitlán alone, including the emperor, and Peru in the 1530s, which aided the European conquerors. A combination of Spanish military attacks and evolutionarily novel diseases finished off the Aztec Empire in the sixteenth century. It is commonly believed that the death of as much as 90% or 95% of the Native American population of the New World was caused by Old World diseases, though new research suggests tuberculosis from seals and sea lions played a significant part.

Similar events took place in Oceania and Madagascar. Smallpox was externally brought to Australia. The first recorded outbreak, in 1789, devastated the Aboriginal population. The extent of the outbreak is disputed, but some sources claim that it killed about 50% of coastal Aboriginal populations on the east coast. There is an ongoing historical debate concerning two rival and irreconcilable theories about how the disease first entered the continent (see History of smallpox). Smallpox continued to be a deadly disease and killed an estimated 300 million people in the twentieth century alone, but a vaccine, the first of any kind, had been available since 1796.

As humans spread around the globe, human societies flourish and become more dependent on trade, and because urbanization means that people leave sparsely-populated rural areas for densely-populated neighborhoods, infectious diseases spread much more easily. Outbreaks are frequent, even in the modern era, but medical advances have been able to alleviate their impacts. In fact, the human population grew tremendously in the twentieth century, as did the population of farm animals, from which diseases could jump to humans, but in the developed world and increasingly also in the developing world, people are less likely to fall victim to infectious diseases than ever before. For instance, the advent of antibiotics, starting with penicillin in 1928, has resulted in the saving of the lives of hundreds of millions of people suffering from bacterial infections. However, there is no guarantee that would continue because bacteria are becoming increasingly resistant to antibiotics, and doctors and public health experts such as former Chief Medical Officer for England Sally Davies have even warned of an incoming "antibiotic apocalypse." The World Health Organization warned in 2019 that the anti-vaccination movement was one of the top threats to global health because it has led to the return of almost-forgotten diseases such as measles.

Demographic dynamics

Writing in The Histories, the Greek historian Polybius largely blamed the decline of the Hellenistic world on low fertility rates. He asserted that while protracted wars and deadly epidemics were absent, people were generally more interested in "show and money and the pleasures of an idle life" than in marrying and raising children. Those who had children, according to him, had no more than one or two, with the express intention of "leaving them well off or bringing them up in extravagant luxury." However, it is difficult to estimate the actual fertility rate of Greece at the time because Polybius did not provide any data for analysis but gave only a narrative that likely came from his impression of the kinds of Greeks with whom he was familiar: the elites, rather than the commoners. Otherwise, the population decline would have been abrupt. Nevertheless, the Greek case parallels the Roman one.

But since more plenteous honor has come to planes that yield a sterile shade, than to any three, we fruit-bearers (if as a nut tree I am counted among them) have begun to lexuriate in spreading foliage. How apples grow not every year, and injured grapes and injured berries are brought home: now she that would seem beautiful harms her womb, and rare in these days is she who would be a parent.

Ovid, Nux

By around 100 BC, the notion of romantic love started becoming popular in Rome. In the final years of the Roman Republic, Roman women were well known for divorcing, having extramarital affairs, and being reluctant to bear children. Viewing that as a threat to the social and political order and believing that the Roman upper-class was becoming increasingly cosmopolitan and individualistic, upon the establishment of the Roman Empire, Caesar Augustus introduced legislation designed to increase the birthrate. Men aged 20 to 60 and women aged 20 to 50 were legally obliged to marry, and widowed or divorced individuals within the relevant age range were required to remarry. Exemptions were granted to those who had already had three children in the case of free-born people and four in the case of freed slaves. For political or bureaucratic office, preference was given to those with at least three legitimate children. Diminished inheritance rights awaited those who failed to reproduce. In a speech to Roman nobles, he expressed his pressing concern over the low birthrates of the Roman elite. He also said that freed slaves had been granted citizenship and Roman allies given seats in government to increase the power and prosperity of Rome, but the "original stock" was not replacing itself and leaving the task to foreigners. Roman poet Ovid shared the same observation. (See right.)

However, Augustan pro-natal policies proved unsuccessful. All that they did was fuel nostalgia and disdain for the present and went no further than reaffirming the past-oriented, rural, and patriarchal values of Imperial Rome. Like their Greek counterparts, Roman elites had access to contraception, though that knowledge was lost to Europe during the Middle Ages and the Early Modern Period, and so could enjoy sexual intercourse without having to rear additional children. In other words, people of high socio-economic class of the Greco-Roman world were able to control their own fertility. Also, that ability likely trickled down to the lower classes. In any case, the result was predictable. The absence of modern medicine, which would have extended life expectancy, caused their numbers to start shrinking. Moreover, population decline coincided with people being less religious and more questioning of traditions, both of which contributed to falling fertility as more and more people came to the conclusion that it was up to them, rather than the gods, on how many children they had.

Other population imbalances may occur when low fertility rates coincides with high dependency ratios or when there is an unequal distribution of wealth between elites and commoners, both of which characterized the Roman Empire.

Several key features of human societal collapse can be related to population dynamics. For example, the native population of Cusco, Peru at the time of the Spanish conquest was stressed by an imbalanced sex ratio.

There is strong evidence that humans also display population cycles. Societies as diverse as those of England and France during the Roman, medieval, and early modern eras, of Egypt during Greco-Roman and Ottoman rule, and of various dynasties in China all showed similar patterns of political instability and violence becoming considerably more common after times of relative peace, prosperity, and sustained population growth. Quantitatively, periods of unrest included many times more events of instability per decade and occurred when the population was declining, rather than increasing. Pre-industrial agrarian societies typically faced instability after one or two centuries of stability. However, a population approaching its carrying capacity alone is not enough to trigger general decline if the people remained united and the ruling class strong. Other factors had to be involved, such as having more aspirants for positions of the elite than the society could realistically support (elite overproduction), which led to social strife, and chronic inflation, which caused incomes to fall and threatened the fiscal health of the state. In particular, an excess in especially young adult male population predictably led to social unrest and violence, as the third and higher-order parity sons had trouble realizing their economic desires and became more open to extreme ideas and actions. Adults in their 20s are especially prone to radicalization. Most historical periods of social unrest lacking in external triggers, such as natural calamities, and most genocides can be readily explained as a result of a built-up youth bulge. As those trends intensified, they jeopardized the social fabric, which facilitated the decline.

Military and civilian fatalties
Jared Diamond suggested that Easter Island's society so destroyed their environment that by around 1600, their society had fallen into a downward spiral of warfare, cannibalism, and population decline.

Historical analysts have proposed a myriad of theories to explain the rise and fall of civilizations. Such theories have evolved from being purely social and ethical, to ideological and ethnocentric, and finally to where they are today, multidisciplinary studies. They have become much more sophisticated.

Cognitive decline and loss of creativity

The anthropologist Joseph Tainter theorized that collapsed societies essentially exhausted their own designs and were unable to adapt to natural diminishing returns for what they knew as their method of survival. It matches closely with the historian Arnold J. Toynbee's idea that they were confronted with problems they could not solve. For Toynbee, key to civilization is the ability to solve problems and a society declines when its ability to do so stagnates or falls. (See more in the section Toynbee's theory of decay.) The philosopher Oswald Spengler argued that a civilization in its "winter" would see a disinclination for abstract thinking. The psychologists David Rand and Jonathan Cohen theorized that people switch between two broad modes of thinking. The first is fast and automatic but rigid, and the second is slow and analytical but more flexible. Rand and Cohen believe that explains why people continue with self-destructive behaviors when logical reasoning would have alerted them of the dangers ahead. People switch from the second to the first mode of thinking after the introduction of an invention that dramatically increases the standards of living. Rand and Cohen pointed to the recent examples of the antibiotic overuse leading to resistant bacteria and failure to save for retirement. Tainter noted that according to behavioral economics, the human decision-making process tends to be more irrational than rational and that as the rate of innovation declines, as measured by the number of inventions relative to the amount of money spent on research and development, it becomes progressively harder for there to be a technological solution to the problem of societal collapse.

Edward Dutton and the social scientist Michael Woodley of Menie make the case in their book At Our Wits' End (2018) that to the extent that intelligence is heritable, once a society reaches a certain level of development and prosperity the tendency of the cognitive elite to produce relatively few children (the negative correlation between intelligence and fertility) precipitates its decline. These authors argue that in multiple historical societies, such as Ancient Greece, Ancient Rome, Ancient China, and the Islamic Civilization, the more intelligent individuals not only had access to contraception but were also more likely to use it effectively. While measuring the level of general intelligence (the g-factor) in periods for which there is no psychometric data is problematic, the authors suggest that one could estimate it via proxies, such as the number of innovations per century per billion people.

Social and environmental dynamics

During the 9th century AD, the central Maya region suffered major political collapse, marked by the abandonment of cities

What produces modern sedentary life, unlike nomadic hunter-gatherers, is extraordinary modern economic productivity. Tainter argues that exceptional productivity is actually more the sign of hidden weakness because of a society's dependence on it and its potential to undermine its own basis for success by not being self limiting, as demonstrated in Western culture's ideal of perpetual growth.

As a population grows and technology makes it easier to exploit depleting resources, the environment's diminishing returns are hidden from view. Societal complexity is then potentially threatened if it develops beyond what is actually sustainable, and a disorderly reorganization were to follow. The scissors model of Malthusian collapse, in which the population grows without limit but not resources, is the idea of great opposing environmental forces cutting into each other.

The complete breakdown of economic, cultural, and social institutions with ecological relationships is perhaps the most common feature of collapse. In his book Collapse: How Societies Choose to Fail or Succeed, Jared Diamond proposes five interconnected causes of collapse that may reinforce each other: non-sustainable exploitation of resources, climate changes, diminishing support from friendly societies, hostile neighbors, and inappropriate attitudes for change.

Energy return on investment

Energy has played a crucial role throughout human history. Energy is linked to the birth, growth, and decline of each and every society. Energy surplus is required for the division of labor and the growth of cities. Massive energy surplus is needed for widespread wealth and cultural amenities. Economic prospects fluctuate in tandem with a society's access to cheap and abundant energy.

Thomas Homer-Dixon and Charles Hall proposed an economic model called energy return on investment (EROI), which measures the amount of surplus energy a society gets from using energy to obtain energy. Energy shortages drive up prices and as such provide an incentive to explore and extract previously uneconomical sources, which may still be plentiful, but more energy would be required, and the EROI is then not as high as initially thought.

There would be no surplus if EROI approaches 1:1. Hall showed that the real cutoff is well above that and estimated that 3:1 to sustain the essential overhead energy costs of a modern society. The EROI of the most preferred energy source, petroleum, has fallen in the past century from 100:1 to the range of 10:1 with clear evidence that the natural depletion curves all are downward decay curves. An EROI of more than ~3 then is what appears necessary to provide the energy for socially important tasks, such as maintaining government, legal and financial institutions, a transportation infrastructure, manufacturing, building construction and maintenance, and the lifestyles of all members of a given society.

The social scientist Luke Kemp indicated that alternative sources of energy, such as solar panels, have a low EROI because they have low energy density, meaning they require a lot of land, and require substantial amounts of rare earth metals to produce. Charles Hall and his colleagues reached the same conclusion. There is no on-site pollution, but the EROI of renewable energy sources may be too low for them to be considered a viable alternative to fossil fuels, which continue to provide the majority of the energy consumed by humanity (79% as of 2019). Moreover, renewable energy is intermittent and requires large and expensive storage facilities in order to be a base-load source for the power grid (20% or more). In that case, its EROI would be even lower. Paradoxically, therefore, expansions of renewable energy require more consumption of fossil fuels. For Hall and his colleagues, human societies in the previous few centuries could solve or at least alleviate many of their problems by making technological innovations and by consuming more energy, but contemporary society faces the difficult challenge of declining EROI for its most useful energy source, fossil fuels, and low EROI for alternatives.

The mathematician Safa Motesharrei and his collaborators showed that the use of non-renewable resources such as fossil fuels allows populations to grow to one order of magnitude larger than they would using renewable resources alone and as such is able to postpone societal collapse. However, when collapse finally comes, it is much more dramatic. Tainter warned that in the modern world, if the supply of fossil fuels were somehow cut off, shortages of clean water and food would ensue, and millions would die in a few weeks in the worse-case scenario.

Homer-Dixon asserted that a declining EROI was one of the reasons that the Roman Empire declined and fell. The historian Joseph Tainter made the same claim about the Mayan Empire.

Models of societal response

According to Joseph Tainter (1990), too many scholars offer facile explanations of societal collapse by assuming one or more of the following three models in the face of collapse:

  1. The Dinosaur, a large-scale society in which resources are being depleted at an exponential rate, but nothing is done to rectify the problem because the ruling elite are unwilling or unable to adapt to those resources' reduced availability. In this type of society, rulers tend to oppose any solutions that diverge from their present course of action but favor intensification and commit an increasing number of resources to their present plans, projects, and social institutions.
  2. The Runaway Train, a society whose continuing function depends on constant growth (cf. Frederick Jackson Turner's Frontier Thesis). This type of society, based almost exclusively on acquisition (such as pillaging or exploitation), cannot be sustained indefinitely. The Assyrian, Roman and Mongol Empires, for example, all fractured and collapsed when no new conquests could be achieved.
  3. The House of Cards, a society that has grown to be so large and include so many complex social institutions that it is inherently unstable and prone to collapse. This type of society has been seen with particular frequency among Eastern Bloc and other communist nations, in which all social organizations are arms of the government or ruling party, such that the government must either stifle association wholesale (encouraging dissent and subversion) or exercise less authority than it asserts (undermining its legitimacy in the public eye).
    By contrast, as Alexis de Tocqueville observed, when voluntary and private associations are allowed to flourish and gain legitimacy at an institutional level, they complement and often even supplant governmental functions. They provide a "safety valve" for dissent, assist with resource allocation, provide for social experimentation without the need for governmental coercion, and enable the public to maintain confidence in society as a whole, even during periods of governmental weakness.

Tainter's critique

Tainter argues that those models, though superficially useful, cannot severally or jointly account for all instances of societal collapse. Often, they are seen as interconnected occurrences that reinforce one another.

Tainter considers that social complexity is a recent and comparatively-anomalous occurrence, requiring constant support. He asserts that collapse is best understood by grasping four axioms. In his own words (p. 194):

  1. human societies are problem-solving organizations;
  2. sociopolitical systems require energy for their maintenance;
  3. increased complexity carries with it increased costs per capita; and
  4. investment in sociopolitical complexity as a problem-solving response reaches a point of declining marginal returns.

With those facts in mind, collapse can simply be understood as a loss of the energy needed to maintain social complexity. Collapse is thus the sudden loss of social complexity, stratification, internal and external communication and exchange, and productivity.

Toynbee’s theory of decay

In his acclaimed 12-volume work, A Study of History (1934–1961), the British historian Arnold J. Toynbee explored the rise and fall of 28 civilizations and came to the conclusion that civilizations generally collapsed mainly by internal factors, factors of their own making, but external pressures also played a role. He theorized that all civilizations pass through several distinct stages: genesis, growth, time of troubles, universal state, and disintegration.

For Toynbee, a civilization is born when a "creative minority" successfully responds to the challenges posed by its physical, social, and political environment. However, the fixation on the old methods of the "creative minority" leads it to eventually cease to be creative and degenerate into merely a "dominant minority" (that forces the majority to obey without meriting obedience), which fails to recognize new ways of thinking. He argues that creative minorities deteriorate from a worship of their "former self", by which they become prideful, and they fail in adequately addressing the next challenge that they face. Similarly, the German philosopher Oswald Spengler discussed the transition from Kultur to Zivilisation in his The Decline of the West (1918).

Toynbee argues that the ultimate sign a civilization has broken down is when the dominant minority forms a Universal State, which stifles political creativity. He states:

First the Dominant Minority attempts to hold by force - against all right and reason - a position of inherited privilege which it has ceased to merit; and then the Proletariat repays injustice with resentment, fear with hate, and violence with violence when it executes its acts of secession. Yet the whole movement ends in positive acts of creation - and this on the part of all the actors in the tragedy of disintegration. The Dominant Minority creates a universal state, the Internal Proletariat a universal church, and the External Proletariat a bevy of barbarian war-bands.

He argues that as civilizations decay, they form an "Internal Proletariat" and an "External Proletariat." The Internal proletariat is held in subjugation by the dominant minority inside the civilization, and grows bitter; the external proletariat exists outside the civilization in poverty and chaos and grows envious. He argues that as civilizations decay, there is a "schism in the body social", whereby abandon and self-control together replace creativity, and truancy and martyrdom together replace discipleship by the creative minority.

He argues that in that environment, people resort to archaism (idealization of the past), futurism (idealization of the future), detachment (removal of oneself from the realities of a decaying world), and transcendence (meeting the challenges of the decaying civilization with new insight, as a prophet). He argues that those who transcend during a period of social decay give birth to a new Church with new and stronger spiritual insights around which a subsequent civilization may begin to form after the old has died. Toynbee's use of the word 'church' refers to the collective spiritual bond of a common worship, or the same unity found in some kind of social order.

The historian Carroll Quigley expanded upon that theory in The Evolution of Civilizations (1961, 1979). He argued that societal disintegration involves the metamorphosis of social instruments, which were set up to meet actual needs, into institutions, which serve their own interest at the expense of social needs. However, in the 1950s, Toynbee's approach to history, his style of civilizational analysis, started to face skepticism from mainstream historians who thought it put an undue emphasis on the divine, which led to his academic reputation declining. For a time, however, Toynbee's Study remained popular outside academia. Interest revived decades later with the publication of The Clash of Civilizations (1997) by the political scientist Samuel P. Huntington, who viewed human history as broadly the history of civilizations and posited that the world after the end of the Cold War will be multipolar and one of competing major civilizations, which are divided by "fault lines."

Systems science

Developing an integrated theory of societal collapse that takes into account the complexity of human societies remains an open problem. Researchers currently have very little ability to identify internal structures of large distributed systems like human societies. Genuine structural collapse seems, in many cases, the only plausible explanation supporting the idea that such structures exist. However, until they can be concretely identified, scientific inquiry appears limited to the construction of scientific narratives, using systems thinking for careful storytelling about systemic organization and change.

In the 1990s, the evolutionary anthropologist and quantitative historian Peter Turchin noticed that the equations used to model the populations of predators and preys can also be used to describe the ontogeny of human societies. He specifically examined how social factors such as income inequality were related to political instability. He found recurring cycles of unrest in historical societies such as Ancient Egypt, China, and Russia. He specifically identified two cycles, one long and one short. The long one, what he calls the "secular cycle," lasts for approximately two to three centuries. A society starts out fairly equal. Its population grows and the cost of labor drops. A wealthy upper class emerges, and life for the working class deteriorates. As inequality grows, a society becomes more unstable with the lower-class being miserable and the upper-class entangled in infighting. Exacerbating social turbulence eventually leads to collapse. The shorter cycle lasts for about 50 years and consists of two generations, one peaceful and one turbulent. Looking at US history, for example, Turchin identified times of serious sociopolitical instability in 1870, 1920, and 1970. He announced in 2010 that he had predicted that in 2020, the US would witness a period of unrest at least on the same level as 1970 because the first cycle coincides with the turbulent part of the second in around 2020. He also warned that the US was not the only Western nation under strain.

However, Turchin's model can only paint the broader picture and cannot pinpoint how bad things can get and what precisely triggers a collapse. The mathematician Safa Motesharrei also applied predator-prey models to human society, with the upper class and the lower class being the two different types of "predators" and natural resources being the "prey." He found that either extreme inequality or resource depletion facilitates a collapse. However, a collapse is irreversible only if a society experiences both at the same time, as they "fuel each other."

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By reversion or simplification

During the course of the 15th century, nearly all of Angkor was abandoned

By absorption

The Champa civilization once occupied parts of modern-day Central and Southern Vietnam.

By extinction or evacuation

Malthusian and environmental collapse themes

Cultural and institutional collapse themes

Systems science

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  2. The Vandals thus made themselves the origin of the modern English word 'vandalism'.
  3. North and South here are with respect to the Gianh River, which is close to the Bến Hải River, or approximately the 17th Parallel, used for the Partition of Vietnam after the First Indochinese War and before the Second Indochinese War, commonly known as the Vietnam War.
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Societal collapse
Societal collapse Language Watch Edit Societal collapse also known as civilizational collapse is the fall of a complex human society characterized by the loss of cultural identity and of socioeconomic complexity the downfall of government and the rise of violence 1 Possible causes of a societal collapse include natural catastrophe war pestilence famine population decline and mass migration A collapsed society may revert to a more primitive state Dark Ages be absorbed into a stronger society or completely disappear Destruction from The Course of Empire by Thomas Cole 1836 Desolation from The Course of Empire by Thomas Cole 1836 Virtually all civilizations have suffered such a fate regardless of their size or complexity but some of them later revived and transformed such as China India and Egypt However others never recovered such as the Western and Eastern Roman Empires the Mayan civilization and the Easter Island civilization 1 Societal collapse is generally quick 1 but rarely abrupt 2 However some cases involve not a collapse but only a gradual fading away such as the British Empire since 1918 3 Anthropologists quantitative historians and sociologists have proposed a variety of explanations for the collapse of civilizations involving causative factors such as environmental change depletion of resources unsustainable complexity invasion disease decay of social cohesion rising inequality secular decline of cognitive abilities loss of creativity and misfortune 1 4 5 However complete extinction of a culture is not inevitable and in some cases the new societies that arise from the ashes of the old one are evidently its offspring despite a dramatic reduction in sophistication 4 Moreover the influence of a collapsed society such as the Western Roman Empire may linger on long after its death 6 The study of societal collapse collapsology is a topic for specialists of history anthropology sociology and political science More recently they are joined by experts in cliodynamics and study of complex systems 7 4 Contents 1 Concept 2 Societal longevity 3 Causes of collapse 3 1 Natural disasters and climate change 3 2 Foreign invasions and mass migration 3 3 Famine economic depression and internal strife 3 4 Disease outbreaks 3 5 Demographic dynamics 4 Theories 4 1 Cognitive decline and loss of creativity 4 2 Social and environmental dynamics 4 3 Energy return on investment 4 4 Models of societal response 4 4 1 Tainter s critique 4 5 Toynbee s theory of decay 4 6 Systems science 5 Examples of civilizations and societies that have collapsed 5 1 By reversion or simplification 5 2 By absorption 5 3 By extinction or evacuation 6 See also 7 Notes 8 References 9 Bibliography 10 Further reading 11 External linksConcept EditJoseph Tainter frames societal collapse in his The Collapse of Complex Societies 1988 which is a seminal and founding work of the academic discipline on societal collapse 8 He elaborates that collapse is a broad term but in the sense of societal collapse he views it as a political process 9 He further narrows societal collapse as a rapid process within few decades of substantial loss of sociopolitical structure giving the fall of the Western Roman Empire as the most widely known instance of collapse in the Western world 9 Others particularly in response to the popular Collapse 2005 by Jared Diamond 10 and more recently have argued that societies discussed as cases of collapse are better understood through resilience and societal transformation 11 or reorganization especially if collapse is understood as a complete end of political systems which according to Shmuel Eisenstadt has not taken place at any point 12 Eisenstadt also points out that a clear differentiation between total or partial decline and possibilities of regeneration is crucial for the preventive purpose of the study of societal collapse 12 Societal longevity EditMain articles Societal transformation and Community resilience The social scientist Luke Kemp analyzed dozens of civilizations which he defined as a society with agriculture multiple cities military dominance in its geographical region and a continuous political structure from 3000 BC to 600 AD and calculated that the average life span of a civilization is close to 340 years 1 Of them the most durable were the Kushite Kingdom in Northeast Africa 1 150 years the Aksumite Empire in Africa 1 100 years and the Vedic civilization in South Asia and the Olmecs in Mesoamerica both 1 000 years and the shortest lived were the Nanda Empire in India 24 and the Qin Dynasty in China 14 13 A statistical analysis of empires by complex systems specialist Samuel Arbesman suggests that collapse is generally a random event and does not depend on age That is analogous to what evolutionary biologists call the Red Queen hypothesis which asserts that for a species in a harsh ecology extinction is a persistent possibility 1 Contemporary discussions about societal collapse are seeking resilience by suggesting societal transformation 14 Causes of collapse EditBecause human societies are complex systems common factors may contribute to their decline that are economical environmental demographic social and cultural and they may cascade into another and build up to the point that could overwhelm any mechanisms that would otherwise maintain stability Unexpected and abrupt changes which experts call nonlinearities are some of the warnings signs 3 In some cases a natural disaster e g tsunami earthquake pandemic massive fire or climate change may precipitate a collapse Other factors such as a Malthusian catastrophe overpopulation or resource depletion might be contributory factors of collapse but studies of past societies seem to suggest that they did not cause the collapse alone 15 Significant inequity and exposed corruption may combine with lack of loyalty to established political institutions and result in an oppressed lower class rising up and seizing power from a smaller wealthy elite in a revolution The diversity of forms that societies evolve corresponds to diversity in their failures Jared Diamond suggests that societies have also collapsed through deforestation loss of soil fertility restrictions of trade and or rising endemic violence 16 Any society has periods of prosperity and hardship but when decline from the height of civilization is that dramatic one can safely say that it has collapsed 17 However in the case of the Western Roman Empire some argued that it did not collapse but merely transformed 18 Natural disasters and climate change Edit Main article Climate apocalypse The Indus Valley Civilization likely declined because of a long lasting drought Archeologists identified signs of a megadrought for a millennium between 5 000 and 4 000 years ago in Africa and Asia The drying of the Green Sahara not only turned it into a desert but also disrupted the monsoon seasons in South and Southeast Asia and caused flooding in East Asia which prevented successful harvest and the development of complex culture It coincided with and may have caused the decline and the fall of the Akkadian Empire in Mesopotamia and the Indus Valley Civilization 19 The dramatic shift in climate is known as the 4 2 kiloyear event 20 The highly advanced Indus Valley Civilization took roots around 3000 BC in what is now northwestern India and Pakistan and collapsed around 1700 BC Since the Indus script has yet to be deciphered the causes of its demise remain a mystery but there is some evidence pointing to natural disasters 21 Signs of a gradual decline began to emerge in 1900 BC and two centuries later most of the cities had been abandoned Archeological evidence suggests an increase in interpersonal violence and in infectious diseases like leprosy and tuberculosis 22 23 Historians and archeologists believe that severe and long lasting drought and a decline in trade with Egypt and Mesopotamia caused the collapse 24 Evidence for earthquakes has also been discovered Sea level changes are also found at two possible seaport sites along the Makran coast which are now inland Earthquakes may have contributed to decline of several sites by direct shaking damage or by changes in sea level or in water supply 25 26 27 Volcanic eruptions can abruptly influence the climate During a large eruption sulfur dioxide SO2 is expelled into the stratosphere where it could stay for years and gradually get oxidized into sulfate aerosols Being highly reflective sulfate aerosols reduce the incident sunlight and cool the Earth s surface By drilling into glaciers and ice sheets scientists can access the archives of the history of atmospheric composition A team of multidisciplinary researchers led by Joseph McConnell of the Desert Research Institute in Reno Nevada deduced that a volcanic eruption occurred in 43 BC a year after the assassination of Julius Caesar on the Ides of March March 15 in 44 BC which left a power vacuum and led to bloody civil wars According to historical accounts it was also a period of poor weather crop failure widespread famine and disease Analyses of tree rings and cave stalagmites from different parts of the globe provided complementary data The Northern Hemisphere got drier but the Southern Hemisphere became wetter Indeed the Greek historian Appian recorded that there was a lack of flooding in Egypt which also faced famine and pestilence Rome s interest in Egypt as a source of food intensified and the aforementioned problems and civil unrest weakened Egypt s ability to resist Egypt came under Roman rule after Cleopatra committed suicide in 30 BC While it is difficult to say for certain whether Egypt would have become a Roman province if Okmok volcano in modern day Alaska had not erupted the eruption likely hastened the process 28 Global average temperatures show that the Little Ice Age was not a distinct global time period but the end of a long temperature decline which preceded the recent global warming 29 More generally recent research pointed to climate change as a key player in the decline and fall of historical societies in China the Middle East Europe and the Americas In fact paleoclimatogical temperature reconstruction suggests that historical periods of social unrest societal collapse and population crash and significant climate change often occurred simultaneously A team of researchers from Mainland China and Hong Kong were able to establish a causal connection between climate change and large scale human crises in pre industrial times Short term crises may be caused by social problems but climate change was the ultimate cause of major crises starting with economic depressions 30 Moreover since agriculture is highly dependent on climate any changes to the regional climate from the optimum can induce crop failures 31 The Mongol conquests corresponded to a period of cooling in the Northern Hemisphere between the thirteenth and fourteenth centuries when the Medieval Warm Period was giving way to the Little Ice Age which caused ecological stress In Europe the cooling climate did not directly facilitate the Black Death but it caused wars mass migration and famine which helped diseases spread 31 The Thirty Years War devastated much of Europe and was one of the many political upheavals during the General Crisis of the Seventeenth Century which is causally linked to the Little Ice Age A more recent example is the General Crisis of the Seventeenth Century in Europe which was a period of inclement weather crop failure economic hardship extreme intergroup violence and high mortality because of the Little Ice Age The Maunder Minimum involved sunspots being exceedingly rare Episodes of social instability track the cooling with a time lap of up to 15 years and many developed into armed conflicts such as the Thirty Years War 1618 1648 30 which started as a war of succession to the Bohemian throne Animosity between Protestants and Catholics in the Holy Roman Empire in modern day Germany added fuel to the fire Soon it escalated to a huge conflict that involved all major European powers and devastated much of Germany When the war had ended some regions of the empire had seen their populations drop by as much as 70 32 note 1 However not all societies faced crises during this period Tropical countries with high carrying capacities and trading economies did not suffer much because the changing climate did not induce an economic depression in those places 30 Moreover by the mid eighteenth century as global temperatures started to rise the ecological stress faced by Europeans also began to fade Mortality rates dropped and the level of violence fell which paved the way for the Pax Britannica a period that witnessed the emergence of a variety of innovations in technology which enabled industrialization medicine which improved hygiene and social welfare such as the world s first welfare programs in Germany making life even more comfortable 17 Foreign invasions and mass migration Edit See also Bond event Map of the Late Bronze Age Collapse ca 1200 BC in the Eastern Mediterranean A mysterious loose confederation of fierce maritime marauders known as the Sea Peoples was identified as one of the main causes of the Late Bronze Age collapse in the Eastern Mediterranean 33 The Sea Peoples might have themselves been victims of the environmental changes that led to widespread famine and precipitated the Collapse 2 After the Battle of Kadesh against the Egyptians in 1285 BC the Hittite Empire began to show signs of decline Attacks by the Sea Peoples accelerated the process and internal power struggles crop failures and famine were contributory factors The Egyptians with whom the Hittites signed a peace treaty supplied them with food in times of famine but it was not enough Around 1200 BC the Sea Peoples seized a port on the west coast of Asia Minor cutting off the Hittites from their trade routes from which their supply of grain came Hattusa the Hittite capital was destroyed Some Hittite territories survived but would be were eventually occupied by the Assyrians in the seventh century BC 34 The Minoan Civilization based on Crete centered on religious rituals and seaborne trade In around 1450 BC it was absorbed into Mycenaean Greece which itself went into serious decline around 1200 BC because of various military conflicts including the Dorian invasion from the north and attacks from the Sea Peoples 35 Barbarian invasions played an important role in the fall of the Western Roman Empire In the third century BC a Eurasian nomadic people the Xiongnu began threatening China s frontiers but by the first century BC they had been completely expelled They then turned their attention westward and displaced various other tribes in Eastern and Central Europe which led to a cascade of events Attila rose to power as leader of the Huns and initiated a campaign of invasions and looting and went as far as Gaul modern day France Attila s Huns were clashing with the Roman Empire which had already been divided into two halves for ease of administration the Eastern Roman Empire and the Western Roman Empire Despite their decisive victory at the Battle of Chalons in 451 AD the Romans were unable to stop Attila from attacking Roman Italy Northern Italian cities like Milan were ravaged The Huns never again posed a threat to the Romans after Attila s death but the rise of the Huns also forced the Germanic peoples out of their territories and made those groups press their way into parts of France Spain Italy and even as far south as North Africa The city of Rome itself came under attack by the Visigoths in 410 and was plundered by the Vandals in 455 note 2 36 A combination of internal strife economic weakness and relentless invasions by the Germanic peoples pushed the Western Roman Empire into terminal decline The last Western Roman Emperor Romulus Augustulus was dethroned in 476 by the German Odoacer who declared himself King of Italy 37 In the eleventh century AD North Africa s populous and flourishing civilization collapsed after it had exhausted its resources in internal fighting and suffering devastation from the invasion of the Bedouin tribes of Banu Sulaym and Banu Hilal 38 Ibn Khaldun noted that all of the lands ravaged by Banu Hilal invaders had become arid desert 39 Vietnam under Emperor Minh Mạng superimposed on modern political maps In 1206 a warlord achieved dominance over all Mongols with the title Genghis Khan and began his campaign of territorial expansion The Mongols highly flexible and mobile cavalry enabled them to conquer their enemies with efficiency and swiftness 40 In the brutal pillaging that followed Mongol invasions during the thirteenth and fourteenth centuries the invaders decimated the populations of China Russia the Middle East and Islamic Central Asia Later Mongol leaders such as Timur destroyed many cities slaughtered thousands of people and irreparably damaged the ancient irrigation systems of Mesopotamia The invasions transformed a settled society to a nomadic one 41 In China for example a combination of war famine and pestilence during the Mongol conquests halved the population a decline of around 55 million people 31 The Mongols also displaced large numbers of people and created power vacuums The Khmer Empire went into decline and was replaced by the Thais who were pushed southward by the Mongols The Vietnamese who succeeded in defeating the Mongols also turned their attention to the south and by 1471 began to subjugate the Chams 42 When Vietnam s Later Le Dynasty went into decline in the late 1700s a bloody civil war erupted between the Trịnh family in the north and the Nguyễn family in the south 43 note 3 More Cham provinces were seized by the Nguyễn warlords 44 Finally Nguyễn Anh emerged victorious and declared himself Emperor of Vietnam changing the name from Annam with the title Gia Long and established the Nguyễn Dynasty 43 The last remaining principality of Champa Panduranga modern day Phan Rang Vietnam survived until 1832 45 when Emperor Minh Mạng Nguyễn Phuc Đảm conquered it after centuries of Cham Vietnamese wars Vietnam s policy of assimilation involved the forcefeeding of pork to Muslims and beef to Hindus which fueled resentment An uprising followed the first and only war between Vietnam and the jihadists until it was crushed 46 47 48 Famine economic depression and internal strife Edit Around 1210 BC the New Kingdom of Egypt shipped large amounts of grains to the disintegrating Hittite Empire Thus there had been a food shortage in Anatolia but not the Nile Valley 2 However that soon changed Although Egypt managed to deliver a decisive and final defeat to the Sea Peoples at the Battle of Xois Egypt itself went into steep decline The collapse of all other societies in the Eastern Mediterranean disrupted established trade routes and caused widespread economic depression Government workers became underpaid which resulted in the first labor strike in recorded history and undermined royal authority 33 There was also political infighting between different factions of government Bad harvest from the reduced flooding at the Nile led to a major famine Food prices rose to eight times their normal values and occasionally even reached twenty four times Runaway inflation followed Attacks by the Libyans and Nubians made things even worse Throughout the Twentieth Dynasty 1187 1064 BC Egypt devolved from a major power in the Mediterranean to a deeply divided and weakened state which later came to be ruled by the Libyans and the Nubians 2 Between 481 BC and 221 BC the Period of the Warring States in China ended by King Zheng of the Qin dynasty succeeding in defeating six competing factions and thus becoming the first Chinese emperor titled Qin Shi Huang A ruthless but efficient ruler he raised a disciplined and professional army and introduced a significant number of reforms such as unifying the language and creating a single currency and system of measurement In addition he funded dam constructions and began building the first segment of what was to become the Great Wall of China to defend his realm against northern nomads Nevertheless internal feuds and rebellions made his empire fall apart after his death in 210 B C 49 In the early fourteenth century AD Britain suffered repeated rounds of crop failures from unusually heavy rainfall and flooding Much livestock either starved or drowned Food prices skyrocketed and King Edward II attempted to rectify the situation by imposing price controls but vendors simply refused to sell at such low prices In any case the act was abolished by the Lincoln Parliament in 1316 Soon people from commoners to nobles were finding themselves short of food Many resorted to begging crime and eating animals they otherwise would not eat People in northern England had to deal with raids from Scotland There were even reports of cannibalism In Continental Europe things were at least just as bad The Great Famine of 1315 1317 coincided with the end of the Medieval Warm Period and the start of the Little Ice Age Some historians suspect that the change in climate was due to Mount Tarawera in New Zealand erupting in 1314 50 The Great Famine was however only one of the calamities striking Europe that century as the Hundred Years War and Black Death would soon follow 50 51 Also see the Crisis of the Late Middle Ages Recent analysis of tree rings complement historical records and show that the summers of 1314 1316 were some of the wettest on record over a period of 700 years 51 Disease outbreaks Edit The angel of death striking a door during the plague of Rome engraving by Levasseur after Jules Elie Delaunay 1828 1891 Historically the dawn of agriculture led to the rise of contagious diseases 52 Compared to their hunting gathering counterparts agrarian societies tended to be sedentary have higher population densities be in frequent contact with livestock and be more exposed to contaminated water supplies and higher concentrations of garbage Poor sanitation a lack of medical knowledge superstitions and sometimes a combination of disasters exacerbated the problem 1 52 53 The journalist Michael Rosenwald wrote that history shows that past pandemics have reshaped societies in profound ways Hundreds of millions of people have died Empires have fallen Governments have cracked Generations have been annihilated 54 From the description of symptoms by the Greek physician Galen which included coughing fever blackish diarrhea swollen throat and thirst modern experts identified the probable culprits of the Antonine Plague 165 180 A5 to have been smallpox or measles 54 55 The disease likely started in China and spread to the West via the Silk Road Roman troops first contracted the disease in the East before they returned home Striking a virgin population the Antonine Plague had dreadful mortality rates between one third to half of the population 60 to 70 million people perished Roman cities suffered from a combination of overcrowding poor hygiene and unhealthy diets They quickly became epicenters Soon the disease reached as far as Gaul and mauled Roman defenses along the Rhine The ranks of the previously formidable Roman army had to be filled with freed slaves German mercenaries criminals and gladiators That ultimately failed to prevent the Germanic tribes from crossing the Rhine On the civilian side the Antonine Plague created drastic shortages of businessmen which disrupted trade and farmers which led to a food crisis An economic depression followed and government revenue fell Some accused Emperor Marcus Aurelius and Co Emperor Lucius Verus both of whom victims of the disease of affronting the gods but others blamed Christians However the Antonine Plague strengthened the position of the monotheistic religion of Christianity in the formerly polytheistic society as Christians won public admiration for their good works Ultimately the Roman army the Roman cities the size of the empire and its trade routes which were required for Roman power and influence to exist facilitated the spread of the disease The Antonine Plague is considered by some historians as a useful starting point for understanding the decline and fall of the Western Roman Empire It was followed by the Plague of Cyprian 249 262 AD and the Plague of Justinian 541 542 Together they cracked the foundations of the Roman Empire 55 In the sixth century AD while the Western Roman Empire had already succumbed to attacks by the Germanic tribes the Eastern Roman Empire stood its ground In fact a peace treaty with the Persians allowed Emperor Justinian the Great to concentrate on recapturing territories belonging to the Western Empire His generals Belisarius and Narses achieved a number of important victories against the Ostrogoths and the Vandals 56 However their hope of keeping the Western Empire was dashed by the arrival of what became known as the Plague of Justinian 541 542 According to the Byzantine historian Procopius of Caesarea the epidemic originated in China and Northeastern India and reached the Eastern Roman Empire via trade routes terminating in the Mediterranean Modern scholarship has deduced that the epidemic was caused by the bacterium Yersinia pestis the same one that would later bring the Black Death the single deadliest pandemic in human history but how many actually died from it remains uncertain Current estimates put the figure between thirty and fifty million people 53 a significant portion of the human population at that time 57 The Plague arguably cemented the fate of Rome 53 The epidemic also devastated the Sasanian Empire in Persia Caliph Abu Bakr seized the opportunity to launch military campaigns that overran the Sassanians and captured Roman held territories in the Caucasus the Levant Egypt and elsewhere in North Africa Before the Justinian Plague the Mediterranean world had been commercially and culturally stable After the Plague it fractured into a trio of civilizations battling for power the Islamic Civilization the Byzantine Empire and what later became known as Medieval Europe With so many people dead the supply of workers many of whom were slaves was critically short Landowners had no choice but to lend pieces of land to serfs to work the land in exchange for military protection and other privileges That sowed the seeds of feudalism 58 Spread of the Bubonic plague through Europe There is evidence that the Mongol expeditions may have spread the bubonic plague across much of Eurasia which helped to spark the Black Death of the early fourteenth century 59 60 61 62 The Italian historian Gabriele de Mussi wrote that the Mongols catapulted the corpses of those who contracted the plague into Caffa now Feodossia Crimea during the siege of that city and that soldiers who were transported from there brought the plague to Mediterranean ports However that account of the origin of the Black Death in Europe remains controversial though plausible because of the complex epidemiology of the plague Modern epidemiologists do not believe that the Black Death had a single source of spreading into Europe Research into the past on this topic is further complicated by politics and the passage of time It is difficult to distinguish between natural epidemics and biological warfare both of which are common throughout human history 60 Biological weapons are economical because they turn an enemy casualty into a delivery system and so were favored in armed conflicts of the past Furthermore more soldiers died of disease than in combat until recently note 4 57 In any case by the 1340s Europe faced a combination of overpopulation and famine As a result many had weakened immune systems especially those living in squalid conditions 17 Whatever its origins the Black Death killed around one third of the population in medieval Europe 17 or about 200 million people 53 The widening trade routes in the Late Middle Ages helped the plague spread rapidly 54 It took the European population more than two centuries to return to its level before the pandemic 53 Consequently it destabilized most of society and likely undermined feudalism and the authority of the Church 63 17 In parts of England for example 80 of the population living in poverty were killed Economic deprivation and war followed 17 In England and France for example a combination of the plague and the Hundred Years War killed about half the population 64 With labor in short supply workers bargaining power increased dramatically Various inventions that reduced the cost of labor saved time and raised productivity such as the three field crop rotation system the iron plow the use of manure to fertilize the soil and the water pumps were widely adopted Many former serfs now free from feudal obligations relocated to the cities and changed profession to crafts and trades The more successful ones became the new middle class Trade flourished as demands for a myriad of consumer goods rose Society became wealthier and could afford to fund the arts and the sciences 58 The Black Death marked the end of the Middle Ages in Europe 17 the Renaissance had begun 58 Aztec victims of smallpox from the Florentine Codex 1540 85 Encounters between European explorers and Native Americans exposed the latter to a variety of diseases of extraordinary virulence Having migrated from Northeastern Asia 15 000 years ago Native Americans had not been introduced to the plethora of contagious diseases that emerged after the rise of agriculture in the Old World As such they had immune systems that were ill equipped to handle the diseases to which their counterparts in Eurasia had become resistant When the Europeans arrived in the Americas in short order the indigenous populations of the Americas found themselves facing smallpox measles whooping cough and the bubonic plague among others In tropical areas malaria yellow fever dengue fever river blindness and others appeared Most of these tropical diseases were traced to Africa 65 Smallpox ravaged Mexico in the 1520s and killed 150 000 in Tenochtitlan alone including the emperor and Peru in the 1530s which aided the European conquerors 66 A combination of Spanish military attacks and evolutionarily novel diseases finished off the Aztec Empire in the sixteenth century 1 65 It is commonly believed that the death of as much as 90 or 95 of the Native American population of the New World was caused by Old World diseases 65 67 though new research suggests tuberculosis from seals and sea lions played a significant part 68 Similar events took place in Oceania and Madagascar 65 Smallpox was externally brought to Australia The first recorded outbreak in 1789 devastated the Aboriginal population The extent of the outbreak is disputed but some sources claim that it killed about 50 of coastal Aboriginal populations on the east coast 69 There is an ongoing historical debate concerning two rival and irreconcilable theories about how the disease first entered the continent see History of smallpox Smallpox continued to be a deadly disease and killed an estimated 300 million people in the twentieth century alone but a vaccine the first of any kind had been available since 1796 57 As humans spread around the globe human societies flourish and become more dependent on trade and because urbanization means that people leave sparsely populated rural areas for densely populated neighborhoods infectious diseases spread much more easily Outbreaks are frequent even in the modern era but medical advances have been able to alleviate their impacts 53 In fact the human population grew tremendously in the twentieth century as did the population of farm animals from which diseases could jump to humans but in the developed world and increasingly also in the developing world people are less likely to fall victim to infectious diseases than ever before For instance the advent of antibiotics starting with penicillin in 1928 has resulted in the saving of the lives of hundreds of millions of people suffering from bacterial infections However there is no guarantee that would continue because bacteria are becoming increasingly resistant to antibiotics and doctors and public health experts such as former Chief Medical Officer for England Sally Davies have even warned of an incoming antibiotic apocalypse The World Health Organization warned in 2019 that the anti vaccination movement was one of the top threats to global health because it has led to the return of almost forgotten diseases such as measles 57 Demographic dynamics Edit Main article Sub replacement fertility Writing in The Histories the Greek historian Polybius largely blamed the decline of the Hellenistic world on low fertility rates He asserted that while protracted wars and deadly epidemics were absent people were generally more interested in show and money and the pleasures of an idle life than in marrying and raising children Those who had children according to him had no more than one or two with the express intention of leaving them well off or bringing them up in extravagant luxury 70 71 However it is difficult to estimate the actual fertility rate of Greece at the time because Polybius did not provide any data for analysis but gave only a narrative that likely came from his impression of the kinds of Greeks with whom he was familiar the elites rather than the commoners Otherwise the population decline would have been abrupt Nevertheless the Greek case parallels the Roman one 5 But since more plenteous honor has come to planes that yield a sterile shade than to any three we fruit bearers if as a nut tree I am counted among them have begun to lexuriate in spreading foliage How apples grow not every year and injured grapes and injured berries are brought home now she that would seem beautiful harms her womb and rare in these days is she who would be a parent Ovid Nux 72 5 By around 100 BC the notion of romantic love started becoming popular in Rome In the final years of the Roman Republic Roman women were well known for divorcing having extramarital affairs and being reluctant to bear children 73 Viewing that as a threat to the social and political order and believing that the Roman upper class was becoming increasingly cosmopolitan and individualistic upon the establishment of the Roman Empire Caesar Augustus introduced legislation designed to increase the birthrate 74 73 Men aged 20 to 60 and women aged 20 to 50 were legally obliged to marry and widowed or divorced individuals within the relevant age range were required to remarry Exemptions were granted to those who had already had three children in the case of free born people and four in the case of freed slaves For political or bureaucratic office preference was given to those with at least three legitimate children Diminished inheritance rights awaited those who failed to reproduce 73 In a speech to Roman nobles he expressed his pressing concern over the low birthrates of the Roman elite He also said that freed slaves had been granted citizenship and Roman allies given seats in government to increase the power and prosperity of Rome but the original stock was not replacing itself and leaving the task to foreigners 75 Roman poet Ovid shared the same observation See right 5 However Augustan pro natal policies proved unsuccessful 5 All that they did was fuel nostalgia and disdain for the present and went no further than reaffirming the past oriented rural and patriarchal values of Imperial Rome 73 Like their Greek counterparts Roman elites had access to contraception though that knowledge was lost to Europe during the Middle Ages and the Early Modern Period and so could enjoy sexual intercourse without having to rear additional children In other words people of high socio economic class of the Greco Roman world were able to control their own fertility Also that ability likely trickled down to the lower classes In any case the result was predictable The absence of modern medicine which would have extended life expectancy caused their numbers to start shrinking Moreover population decline coincided with people being less religious and more questioning of traditions both of which contributed to falling fertility as more and more people came to the conclusion that it was up to them rather than the gods on how many children they had 5 Other population imbalances may occur when low fertility rates coincides with high dependency ratios or when there is an unequal distribution of wealth between elites and commoners both of which characterized the Roman Empire 76 77 78 Several key features of human societal collapse can be related to population dynamics 79 For example the native population of Cusco Peru at the time of the Spanish conquest was stressed by an imbalanced sex ratio 80 There is strong evidence that humans also display population cycles 81 82 Societies as diverse as those of England and France during the Roman medieval and early modern eras of Egypt during Greco Roman and Ottoman rule and of various dynasties in China all showed similar patterns of political instability and violence becoming considerably more common after times of relative peace prosperity and sustained population growth Quantitatively periods of unrest included many times more events of instability per decade and occurred when the population was declining rather than increasing Pre industrial agrarian societies typically faced instability after one or two centuries of stability However a population approaching its carrying capacity alone is not enough to trigger general decline if the people remained united and the ruling class strong Other factors had to be involved such as having more aspirants for positions of the elite than the society could realistically support elite overproduction which led to social strife and chronic inflation which caused incomes to fall and threatened the fiscal health of the state 83 In particular an excess in especially young adult male population predictably led to social unrest and violence as the third and higher order parity sons had trouble realizing their economic desires and became more open to extreme ideas and actions 84 Adults in their 20s are especially prone to radicalization 85 Most historical periods of social unrest lacking in external triggers such as natural calamities and most genocides can be readily explained as a result of a built up youth bulge 84 As those trends intensified they jeopardized the social fabric which facilitated the decline 83 Military and civilian fataltiesTheories Edit Jared Diamond suggested that Easter Island s society so destroyed their environment that by around 1600 their society had fallen into a downward spiral of warfare cannibalism and population decline Historical analysts have proposed a myriad of theories to explain the rise and fall of civilizations 17 Such theories have evolved from being purely social and ethical to ideological and ethnocentric and finally to where they are today multidisciplinary studies They have become much more sophisticated 2 Cognitive decline and loss of creativity Edit The anthropologist Joseph Tainter theorized that collapsed societies essentially exhausted their own designs and were unable to adapt to natural diminishing returns for what they knew as their method of survival 86 It matches closely with the historian Arnold J Toynbee s idea that they were confronted with problems they could not solve For Toynbee key to civilization is the ability to solve problems and a society declines when its ability to do so stagnates or falls 17 See more in the section Toynbee s theory of decay The philosopher Oswald Spengler argued that a civilization in its winter would see a disinclination for abstract thinking 2 The psychologists David Rand and Jonathan Cohen theorized that people switch between two broad modes of thinking The first is fast and automatic but rigid and the second is slow and analytical but more flexible Rand and Cohen believe that explains why people continue with self destructive behaviors when logical reasoning would have alerted them of the dangers ahead People switch from the second to the first mode of thinking after the introduction of an invention that dramatically increases the standards of living Rand and Cohen pointed to the recent examples of the antibiotic overuse leading to resistant bacteria and failure to save for retirement Tainter noted that according to behavioral economics the human decision making process tends to be more irrational than rational and that as the rate of innovation declines as measured by the number of inventions relative to the amount of money spent on research and development it becomes progressively harder for there to be a technological solution to the problem of societal collapse 6 Edward Dutton and the social scientist Michael Woodley of Menie make the case in their book At Our Wits End 2018 that to the extent that intelligence is heritable once a society reaches a certain level of development and prosperity the tendency of the cognitive elite to produce relatively few children the negative correlation between intelligence and fertility precipitates its decline These authors argue that in multiple historical societies such as Ancient Greece Ancient Rome Ancient China and the Islamic Civilization the more intelligent individuals not only had access to contraception but were also more likely to use it effectively While measuring the level of general intelligence the g factor in periods for which there is no psychometric data is problematic the authors suggest that one could estimate it via proxies such as the number of innovations per century per billion people 5 Social and environmental dynamics Edit During the 9th century AD the central Maya region suffered major political collapse marked by the abandonment of cities What produces modern sedentary life unlike nomadic hunter gatherers is extraordinary modern economic productivity Tainter argues that exceptional productivity is actually more the sign of hidden weakness because of a society s dependence on it and its potential to undermine its own basis for success by not being self limiting as demonstrated in Western culture s ideal of perpetual growth 86 As a population grows and technology makes it easier to exploit depleting resources the environment s diminishing returns are hidden from view Societal complexity is then potentially threatened if it develops beyond what is actually sustainable and a disorderly reorganization were to follow The scissors model of Malthusian collapse in which the population grows without limit but not resources is the idea of great opposing environmental forces cutting into each other The complete breakdown of economic cultural and social institutions with ecological relationships is perhaps the most common feature of collapse In his book Collapse How Societies Choose to Fail or Succeed Jared Diamond proposes five interconnected causes of collapse that may reinforce each other non sustainable exploitation of resources climate changes diminishing support from friendly societies hostile neighbors and inappropriate attitudes for change 87 88 Energy return on investment Edit Energy has played a crucial role throughout human history Energy is linked to the birth growth and decline of each and every society Energy surplus is required for the division of labor and the growth of cities Massive energy surplus is needed for widespread wealth and cultural amenities Economic prospects fluctuate in tandem with a society s access to cheap and abundant energy 89 Thomas Homer Dixon and Charles Hall proposed an economic model called energy return on investment EROI which measures the amount of surplus energy a society gets from using energy to obtain energy 90 91 Energy shortages drive up prices and as such provide an incentive to explore and extract previously uneconomical sources which may still be plentiful but more energy would be required and the EROI is then not as high as initially thought 89 There would be no surplus if EROI approaches 1 1 Hall showed that the real cutoff is well above that and estimated that 3 1 to sustain the essential overhead energy costs of a modern society The EROI of the most preferred energy source petroleum has fallen in the past century from 100 1 to the range of 10 1 with clear evidence that the natural depletion curves all are downward decay curves An EROI of more than 3 then is what appears necessary to provide the energy for socially important tasks such as maintaining government legal and financial institutions a transportation infrastructure manufacturing building construction and maintenance and the lifestyles of all members of a given society 91 The social scientist Luke Kemp indicated that alternative sources of energy such as solar panels have a low EROI because they have low energy density meaning they require a lot of land and require substantial amounts of rare earth metals to produce 1 Charles Hall and his colleagues reached the same conclusion There is no on site pollution but the EROI of renewable energy sources may be too low for them to be considered a viable alternative to fossil fuels which continue to provide the majority of the energy consumed by humanity 79 as of 2019 92 Moreover renewable energy is intermittent and requires large and expensive storage facilities in order to be a base load source for the power grid 20 or more In that case its EROI would be even lower Paradoxically therefore expansions of renewable energy require more consumption of fossil fuels For Hall and his colleagues human societies in the previous few centuries could solve or at least alleviate many of their problems by making technological innovations and by consuming more energy but contemporary society faces the difficult challenge of declining EROI for its most useful energy source fossil fuels and low EROI for alternatives 89 The mathematician Safa Motesharrei and his collaborators showed that the use of non renewable resources such as fossil fuels allows populations to grow to one order of magnitude larger than they would using renewable resources alone and as such is able to postpone societal collapse However when collapse finally comes it is much more dramatic 6 93 Tainter warned that in the modern world if the supply of fossil fuels were somehow cut off shortages of clean water and food would ensue and millions would die in a few weeks in the worse case scenario 6 Homer Dixon asserted that a declining EROI was one of the reasons that the Roman Empire declined and fell The historian Joseph Tainter made the same claim about the Mayan Empire 1 Models of societal response Edit According to Joseph Tainter 94 1990 too many scholars offer facile explanations of societal collapse by assuming one or more of the following three models in the face of collapse The Dinosaur a large scale society in which resources are being depleted at an exponential rate but nothing is done to rectify the problem because the ruling elite are unwilling or unable to adapt to those resources reduced availability In this type of society rulers tend to oppose any solutions that diverge from their present course of action but favor intensification and commit an increasing number of resources to their present plans projects and social institutions The Runaway Train a society whose continuing function depends on constant growth cf Frederick Jackson Turner s Frontier Thesis This type of society based almost exclusively on acquisition such as pillaging or exploitation cannot be sustained indefinitely The Assyrian Roman and Mongol Empires for example all fractured and collapsed when no new conquests could be achieved The House of Cards a society that has grown to be so large and include so many complex social institutions that it is inherently unstable and prone to collapse This type of society has been seen with particular frequency among Eastern Bloc and other communist nations in which all social organizations are arms of the government or ruling party such that the government must either stifle association wholesale encouraging dissent and subversion or exercise less authority than it asserts undermining its legitimacy in the public eye By contrast as Alexis de Tocqueville observed when voluntary and private associations are allowed to flourish and gain legitimacy at an institutional level they complement and often even supplant governmental functions They provide a safety valve for dissent assist with resource allocation provide for social experimentation without the need for governmental coercion and enable the public to maintain confidence in society as a whole even during periods of governmental weakness Tainter s critique Edit Tainter argues that those models though superficially useful cannot severally or jointly account for all instances of societal collapse Often they are seen as interconnected occurrences that reinforce one another Tainter considers that social complexity is a recent and comparatively anomalous occurrence requiring constant support He asserts that collapse is best understood by grasping four axioms In his own words p 194 human societies are problem solving organizations sociopolitical systems require energy for their maintenance increased complexity carries with it increased costs per capita and investment in sociopolitical complexity as a problem solving response reaches a point of declining marginal returns With those facts in mind collapse can simply be understood as a loss of the energy needed to maintain social complexity Collapse is thus the sudden loss of social complexity stratification internal and external communication and exchange and productivity Toynbee s theory of decay Edit In his acclaimed 12 volume work A Study of History 1934 1961 the British historian Arnold J Toynbee explored the rise and fall of 28 civilizations and came to the conclusion that civilizations generally collapsed mainly by internal factors factors of their own making but external pressures also played a role 1 He theorized that all civilizations pass through several distinct stages genesis growth time of troubles universal state and disintegration 95 For Toynbee a civilization is born when a creative minority successfully responds to the challenges posed by its physical social and political environment However the fixation on the old methods of the creative minority leads it to eventually cease to be creative and degenerate into merely a dominant minority that forces the majority to obey without meriting obedience which fails to recognize new ways of thinking He argues that creative minorities deteriorate from a worship of their former self by which they become prideful and they fail in adequately addressing the next challenge that they face Similarly the German philosopher Oswald Spengler discussed the transition from Kultur to Zivilisation in his The Decline of the West 1918 95 Toynbee argues that the ultimate sign a civilization has broken down is when the dominant minority forms a Universal State which stifles political creativity He states First the Dominant Minority attempts to hold by force against all right and reason a position of inherited privilege which it has ceased to merit and then the Proletariat repays injustice with resentment fear with hate and violence with violence when it executes its acts of secession Yet the whole movement ends in positive acts of creation and this on the part of all the actors in the tragedy of disintegration The Dominant Minority creates a universal state the Internal Proletariat a universal church and the External Proletariat a bevy of barbarian war bands He argues that as civilizations decay they form an Internal Proletariat and an External Proletariat The Internal proletariat is held in subjugation by the dominant minority inside the civilization and grows bitter the external proletariat exists outside the civilization in poverty and chaos and grows envious He argues that as civilizations decay there is a schism in the body social whereby abandon and self control together replace creativity and truancy and martyrdom together replace discipleship by the creative minority He argues that in that environment people resort to archaism idealization of the past futurism idealization of the future detachment removal of oneself from the realities of a decaying world and transcendence meeting the challenges of the decaying civilization with new insight as a prophet He argues that those who transcend during a period of social decay give birth to a new Church with new and stronger spiritual insights around which a subsequent civilization may begin to form after the old has died Toynbee s use of the word church refers to the collective spiritual bond of a common worship or the same unity found in some kind of social order The historian Carroll Quigley expanded upon that theory in The Evolution of Civilizations 1961 1979 96 He argued that societal disintegration involves the metamorphosis of social instruments which were set up to meet actual needs into institutions which serve their own interest at the expense of social needs 97 However in the 1950s Toynbee s approach to history his style of civilizational analysis started to face skepticism from mainstream historians who thought it put an undue emphasis on the divine which led to his academic reputation declining For a time however Toynbee s Study remained popular outside academia Interest revived decades later with the publication of The Clash of Civilizations 1997 by the political scientist Samuel P Huntington who viewed human history as broadly the history of civilizations and posited that the world after the end of the Cold War will be multipolar and one of competing major civilizations which are divided by fault lines 95 Systems science Edit Developing an integrated theory of societal collapse that takes into account the complexity of human societies remains an open problem 2 Researchers currently have very little ability to identify internal structures of large distributed systems like human societies Genuine structural collapse seems in many cases the only plausible explanation supporting the idea that such structures exist However until they can be concretely identified scientific inquiry appears limited to the construction of scientific narratives 98 2 using systems thinking for careful storytelling about systemic organization and change In the 1990s the evolutionary anthropologist and quantitative historian Peter Turchin noticed that the equations used to model the populations of predators and preys can also be used to describe the ontogeny of human societies He specifically examined how social factors such as income inequality were related to political instability He found recurring cycles of unrest in historical societies such as Ancient Egypt China and Russia He specifically identified two cycles one long and one short The long one what he calls the secular cycle lasts for approximately two to three centuries A society starts out fairly equal Its population grows and the cost of labor drops A wealthy upper class emerges and life for the working class deteriorates As inequality grows a society becomes more unstable with the lower class being miserable and the upper class entangled in infighting Exacerbating social turbulence eventually leads to collapse The shorter cycle lasts for about 50 years and consists of two generations one peaceful and one turbulent Looking at US history for example Turchin identified times of serious sociopolitical instability in 1870 1920 and 1970 He announced in 2010 that he had predicted that in 2020 the US would witness a period of unrest at least on the same level as 1970 because the first cycle coincides with the turbulent part of the second in around 2020 He also warned that the US was not the only Western nation under strain 6 However Turchin s model can only paint the broader picture and cannot pinpoint how bad things can get and what precisely triggers a collapse The mathematician Safa Motesharrei also applied predator prey models to human society with the upper class and the lower class being the two different types of predators and natural resources being the prey He found that either extreme inequality or resource depletion facilitates a collapse However a collapse is irreversible only if a society experiences both at the same time as they fuel each other 6 Examples of civilizations and societies that have collapsed EditThis section needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed September 2013 Learn how and when to remove this template message By reversion or simplification Edit During the course of the 15th century nearly all of Angkor was abandoned Akkadian Empire Hittite Empire Mycenaean Greece Neo Assyrian Empire Angkor civilization of the Khmer Empire Han and Tang Dynasty of China Izapa Maya civilization Classic Maya collapse Munhumutapa Empire OlmecBy absorption Edit The Champa civilization once occupied parts of modern day Central and Southern Vietnam Sumer by the Akkadian Empire Kingdom of Israel by Assyria Ancient Egypt by the Libyans Nubians Assyria Babylonia Persian rule Greece Ptolemaic Dynasty and the Roman Empire 99 Babylonia by the Hittites Britons by the Anglo Saxons and then by the Normans Khazar Khaganate by the Eastern Slavs of the Kievan Rus Eastern Roman Empire Medieval Greek by western and eastern neighbouring powers and ultimately by the Ottoman Empire Destruction of Khitan Western Liao dynasty Jurchen Jin dynasty Tangut Xia Dynasty Nanzhao Song Dynasty Khwarazmian empire Abbasid Caliphate Ayyubids Nizari Ismaili state Sultanate of Rum Kievan Rus Volga Bulgaria and Cumans by the Mongol Empire Champa Kingdom by Vietnam during its Southward Expansion 100 Kingdom of France a medieval absolute monarchy in Western Europe ending with the French Revolution and thus was succeeded by the French First Republic Aztec Incan and Mayan civilizations by the Spanish Empire Seven Spanish Cities by the Mapuche Garamantes by the Umayyad Caliphate Polish Lithuanian Commonwealth by the Kingdom of Prussia Russian Empire and Archduchy of AustriaBy extinction or evacuation Edit Cahokia Norse colony on Greenland Original Polynesian civilization on Pitcairn Island and Henderson Island Malden Island Flinders IslandSee also Edit Civilizations portal History portal Society portal Lost cities Ruins Survivalism Social alienation Weltschmerz Doomer Apocalypticism Doomsday cult Millenarianism Human extinction John B Calhoun s mouse experiments Malthusian and environmental collapse themes Collapsology Behavioral sink rat colony collapse Earth 2100 Ecological collapse Global catastrophic risk Medieval demography Millennium Ecosystem Assessment Human overpopulation Cultural and institutional collapse themes Civil war Economic collapse Failed state Fragile state Group cohesiveness Language death Progress trap Social cycle theory Social disintegration Sociocultural evolution State collapse Urban decay Systems science Failure mode and effects analysis Fault tree analysis Hazard analysis Risk assessment Systems engineeringNotes Edit See the end of the section Demographic dynamics for a chart of the death rate per 100 000 of the Thirty Years War compared to other armed conflicts between 1400 and 2000 The Vandals thus made themselves the origin of the modern English word vandalism North and South here are with respect to the Gianh River which is close to the Bến Hải River or approximately the 17th Parallel used for the Partition of Vietnam after the First Indochinese War and before the Second Indochinese War commonly known as the Vietnam War For example during the Napoleonic Wars for every British soldier who got killed in action eight died of disease During the American Civil War two thirds of the almost 700 000 dead were victims of smallpox dysentery typhoid malaria and pneumonia collectively referred to as the Third Army References Edit a b c d e f g h i j k Kemp Luke 18 February 2019 Are we on the road to civilisation collapse BBC Future Retrieved 5 September 2020 a b c d e f g h Butzer Karl W 6 March 2012 Collapse environment and society Proceedings of the National Academy of Sciences of the United States of America 109 10 3632 3639 doi 10 1073 pnas 1114845109 PMC 3309741 PMID 22371579 a b Nuwer Rachel 18 April 2017 How Western civilisation could collapse BBC Future Retrieved 6 September 2020 a b c Spinney Laura 18 February 2020 Panicking about societal collapse Plunder the bookshelves Nature 578 7795 355 357 Bibcode 2020Natur 578 355S doi 10 1038 d41586 020 00436 3 a b c d e f g Dutton Edward Woodley of Menie Michael 2018 Chapter 11 Did Other Civilizations Show a Rise and Fall in General Intelligence At Our Wits End Why We re Becoming Less Intelligent and What It Means for the Future Exeter United Kingdom Imprint Academic ISBN 978 1 84540 985 2 a b c d e f Spinney Laura 17 January 2018 End of days Is Western civilisation on the brink of collapse New Scientist Pasha Robinson Lucy 7 January 2017 Society could end in less than a decade predicts academic The Independent Retrieved 21 May 2019 Ben Ehrenreich 4 November 2020 How Do You Know When Society Is About to Fall Apart The New York Times Retrieved 10 February 2021 a b Joseph A Tainter 1988 The Collapse of Complex Societies New Studies in Archaeology Cambridge University Press What is collapse Collapse is a broad term that can cover many kinds of processes It means different things to different people Some see collapse as a thing that could happen only to societies organized at the most complex level To them the notion of tribal societies or village horticulturalists collapsing will seem odd Others view collapse in terms of economic disintegration of which the predicted end of industrial society is the ultimate expression Still others question the very utility of the concept pointing out that art styles and literary traditions often survive political decentralization Collapse as viewed in the present work is a political process It may and often does have consequences in such areas as economics art and literature but it is fundamentally a matter of the sociopolitical sphere A society has collapsed when it displays a rapid significant loss of an established level of sociopolitical complexity The term established level is important To qualify as an instance of collapse a society must have been at or developing toward a level of complexity for more than one or two generations The demise of the Carolingian Empire thus is not a case of collapse merely an unsuccessful attempt at empire building The collapse in turn must be rapid taking no more than a few decades and must entail a substantial loss of sociopolitical structure Losses that are less severe or take longer to occur are to be considered cases of weakness and decline The fall of the Roman Empire is in the West the most widely known instance of collapse the one which comes most readily to popular thought Pages 4 5 Patricia A McAnany Norman Yoffee eds 2009 Questioning Collapse Human Resilience Ecological Vulnerability and the Aftermath of Empire Ronald K Faulseit ed 2016 Beyond Collapse Archaeological Perspectives on Resilience Revitalization and Transformation in Complex Societies Occasional Paper Southern Illinois University Press a b Shmuel Eisenstadt 1991 Beyond Collapse In Norman Yoffee George L Cowgill eds The Collapse of Ancient States and Civilizations p 242 Kemp Luke 19 February 2019 The lifespans of ancient civilisations BBC Future Retrieved 6 September 2020 Leonie J Pearson Craig J Pearson 24 July 2012 Societal collapse or 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Sixteenth Century Cusco Peru R Alan Covey Geoff Childs Rebecca Kippen Source Current Anthropology Vol 52 No 3 June 2011 pp 335 360 The University of Chicago Press Population crises and cycles in history OzIdeas 5 April 2011 Archived from the original on 5 April 2011 Weiss V 2020 IQ Means Inequality The Population Cycle that Drives Human History KDP ISBN 979 86 0818440 6 a b Turchin Peter 2 July 2008 Arise cliodynamics Nature 454 7200 34 5 Bibcode 2008Natur 454 34T doi 10 1038 454034a PMID 18596791 S2CID 822431 a b Why a two state solution doesn t guarantee peace in the Middle East Washington Examiner Retrieved 5 April 2017 Turchin Peter 2013 Modeling Social Pressures Toward Political Instability Cliodynamics 4 2 doi 10 21237 C7clio4221333 a b Tainter Joseph A 1990 The Collapse of Complex Societies 1st paperback ed Cambridge Cambridge University Press ISBN 0 521 38673 X Jared Diamond Collapse How Societies Choose to Fail or Succeed Penguin Books 2005 and 2011 ISBN 978 0 241 95868 1 Jared Diamond on why societies collapse TED talk Feb 2003 a b c Hall Charles A S Lambert Jessica G Balogh Stephen B January 2014 EROI of Different Fuels and the Implications for Society Energy Policy 64 141 152 doi 10 1016 j enpol 2013 05 049 Homer Dixon Thomas 2007 The Upside of Down Catastrophe Creativity and the Renewal of Civilization Knopf Canada a b Hall Charles 2009 What is the Minimum EROI that a Sustainable Society Must Have ENERGIES 1 Energy mix Our world in data Retrieved 4 August 2020 Safa Motesharrei Jorge Rivas Eugenia Kalnay Ghassem R Asrar Antonio J Busalacchi Robert F Cahalan Mark A Cane Rita R Colwell Kuishuang Feng Rachel S Franklin Klaus Hubacek Fernando Miralles Wilhelm Takemasa Miyoshi Matthias Ruth Roald Sagdeev Adel Shirmohammadi Jagadish Shukla Jelena Srebric Victor M Yakovenko Ning Zeng December 2016 Modeling sustainability population inequality consumption and bidirectional coupling of the Earth and Human Systems National Science Review 3 4 470 494 doi 10 1093 nsr nww081 PMC 7398446 PMID 32747868 CS1 maint multiple names authors list link Tainter Joseph 1990 The Collapse of Complex Societies Cambridge University Press pp 59 60 a b c Kumar Krishan 3 October 2014 The Return of Civilization and of Arnold Toynbee Comparative Studies in Society and History 56 4 815 843 doi 10 1017 S0010417514000413 The Evolution of Civilizations An Introduction to Historical Analysis 1979 via Internet Archive Harry J Hogan in the foreword p17 and Quigley in the conclusion p416 to Carroll Quigley 1979 The evolution of civilizations an introduction to historical analysis Liberty Press ISBN 0 913966 56 8 Retrieved 26 May 2013 T F Allen J A Tainter et al 2001 Dragnet Ecology The Privilege of Science in a Postmodern World BioScience Clayton Peter A 2006 Chronicle of the Pharaohs The Reign by Reign Record of the Rulers and Dynasties of Ancient Egypt Thames amp Hudson p 217 ISBN 0 500 28628 0 Vachon Michelle Naren Kuch 29 April 2006 A history of Champa The Cambodia Daily English Retrieved 14 January 2021 Bibliography EditNational Geographic 2007 Essential Visual History of the World National Geographic Society ISBN 978 1 4262 0091 5 Further reading EditEhrlich Paul R Ehrlich Anne H 9 January 2013 Can a collapse of global civilization be avoided Proceedings of the Royal Society B 280 1754 20122845 doi 10 1098 rspb 2012 2845 PMC 3574335 PMID 23303549 Comment by Prof Michael Kelly disagreeing with the paper by Ehrlich and Ehrlich and response by the authors Homer Dixon Thomas 2006 The Upside of Down Catastrophe Creativity and the Renewal of Civilization Washington DC Island Press Huesemann Michael H and Joyce A Huesemann 2011 Technofix Why Technology Won t Save Us or the Environment Chapter 6 Sustainability or Collapse New Society Publishers Gabriola Island British Columbia Canada ISBN 978 0 86571 704 6 464 pp Motesharrei Safa Rivas Jorge Kalnay Eugenia 2014 Human and nature dynamics HANDY Modeling inequality and use of resources in the collapse or sustainability of societies Ecological Economics 101 90 102 doi 10 1016 j ecolecon 2014 02 014 Wright Ronald 2004 A Short History of Progress New York Carroll amp Graf Publishers ISBN 0 7867 1547 2 External links EditWikimedia Commons has media related to Societal collapse Collection of articles based on Societal collapse scenarios Society could collapse within a decade mathematical historian predicts News com au 5 January 2017 Retrieved from https en wikipedia org w index php title Societal collapse amp oldid 1051476428, wikipedia, wiki, book,

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