Definition
Civilizational collapse is the relatively rapid loss of a complex society's organizing systems — its central government, trade networks, urban centers, monumental building, and written records. After collapse, the population usually does not vanish, but it lives in smaller, simpler, and more local communities.
Historians study collapse in cases such as the end of the Bronze Age in the eastern Mediterranean, the fall of the western Roman Empire, and the decline of the classic Maya cities.
Why it matters
How it works
Complex societies depend on many interlocking systems: food production, trade, defense, administration, and shared belief. Collapse tends to follow when several stresses strike at once — drought or soil exhaustion, invasion or war, disease, overextension of resources, and loss of political legitimacy. Because the systems are interconnected, failure in one strains the others, and a society that cannot absorb the shocks simplifies rapidly. What survives is a thinner, more local order until new structures slowly emerge.