Why did many Classic Maya cities decline after about 850 CE?

The decline of Classic Maya civilization, which began around 850 CE and led to the abandonment of many major cities, remains a subject of ongoing historical and archaeological debate. There is no single consensus on the cause of this collapse, but scholars generally point to a combination of interconnected factors:12

• Environmental Stress: Severe ecological issues, including deforestation, drought, and the exhaustion of agricultural land, likely undermined the resource base necessary to support large urban populations.132
• Social and Political Instability: Internal civil wars, social structural stresses, and the disruption of vital land and river trade routes contributed to the weakening of Maya political power.3
• Conflict: Armed conflict between rival polities and interventions from central Mexico are considered significant contributors to the decline.32
• Population Factors: Overpopulation and potential demographic shifts, where death rates may have exceeded birth rates, likely played a role in the depopulation of the Central Subregion.134

Following this collapse, many inhabitants migrated toward the highlands of Guatemala and Chiapas or to flourishing centers in the Northern Subregion.1