What are the main two declines of cahokia?

The main two declines of Cahokia were environmental degradation and social upheaval. Deforestation and soil depletion from intensive agriculture led to diminished resources, making it difficult to support the large population. Additionally, social strife, possibly exacerbated by resource shortages, likely contributed to a breakdown in the political and social structures that held the community together. These factors combined to lead to the eventual abandonment of the site.