Societal collapse

Societal collapse occurs when a complex human society experiences a sudden loss of social complexity. This process involves the breakdown of a government and the loss of cultural identity. As a society collapses, its ability to function as an adaptive system diminishes. This often leads to an increase in violence and social instability. A collapsed society might revert to a more primitive way of life. It might also be absorbed by a stronger neighboring society. In some cases, a culture may disappear entirely.

Scholars define the specific mechanics of collapse to distinguish it from simple decline. Joseph Tainter, in his 1988 book *The Collapse of Complex Societies*, describes collapse as a political process. For a society to truly collapse, it must lose an established level of sociopolitical structure. This complexity must have been maintained for more than one or two generations. Tainter argues that true collapse is a rapid process. It should take no more than a few decades to occur. If a decline is slow or less severe, it is categorized as weakness rather than collapse. The fall of the Western Roman Empire is the most famous example of this process.

Many different factors can trigger these cascading failures in a complex system. Environmental factors like climate change or natural disasters can act as immediate triggers. A tsunami, earthquake, or massive fire can cause sudden, abrupt changes. These are known as nonlinearities, where small changes lead to large, unexpected results. Other contributing factors include resource depletion or overpopulation, often called a Malthusian catastrophe. Economic collapse and mass migration can also weaken a society. Sometimes, social issues like growing inequality or corruption play a role. If people lose loyalty to their political institutions, they may rise up in revolutions.

Climate and environmental shifts have historically played a major role in societal changes. For example, the 4.2-kiloyear event involved a dramatic shift in the global climate. This period saw the drying of the Green Sahara, which turned it into a desert. This change disrupted monsoon seasons in South and Southeast Asia. It also caused flooding in East Asia, which prevented successful harvests. This event may have contributed to the decline of the Akkadian Empire and the Indus Valley Civilization. The Indus Valley Civilization was a highly advanced society that began around 3000 BC. It collapsed around 1700 BC, possibly due to severe drought and declining trade.

Volcanic activity can also influence the climate and impact human populations. Large eruptions expel sulfur dioxide into the stratosphere. This gas turns into sulfate aerosols, which reflect sunlight away from Earth. This process can cool the planet's surface and lead to crop failures. Researchers found that a volcanic eruption occurred in 43 BC near Okmok, Alaska. This happened just after the assassination of Julius Caesar in 44 BC. The eruption likely caused poor weather and famine. This period of unrest may have hastened the Roman takeover of Egypt. Such events show how natural forces and political instability can combine to weaken a state.

Data shows that civilizations have very different lifespans. Social scientist Luke Kemp analyzed many societies from 3000 BC to 600 AD. He defined a civilization as a society with agriculture, multiple cities, and a continuous political structure. On average, these civilizations lasted about 340 years. Some were incredibly durable, like the Kushite Kingdom, which lasted 1,150 years. The Aksumite Empire lasted 1,100 years, and the Olmecs lasted 1,000 years. In contrast, the Nanda Empire lasted only 24 years. The Qin dynasty in China lasted only 14 years.

It is important to note that collapse does not always mean total extinction. Some experts prefer the term "reorganization" or "societal transformation." They argue that cultures often survive even when their political systems fail. The Maya civilization is a notable example of this concept. While the political system of Divine Kingship fell in the eastern lowlands, many cities in the western highlands continued. The Maya people maintained their culture and language into the present day. This suggests that new societies can emerge from the remains of old ones. These new groups are often the offspring of the previous civilization.