Decline of Mississippian Culture in the 1320s

Timeline

1. 1320–1325Cahokia site · IllinoisArchaeological evidence shows that Cahokia's population dropped sharply after the 1250s, leaving only a few residents by the 1320s, with the large mound ceremonial center's functions weakened. The chiefdom alliance that once dominated the Mississippi River Basin dissolved, and regional political authority dispersed to smaller settlements.
2. 1325–1329Southeastern United States · SoutheastIn the 1320s, secondary Mississippian centers such as Etowah and Moundville also showed trends of settlement contraction and increased defensiveness. Agricultural stress from climate change, overexploitation of forest resources, and social conflict are considered important factors driving regional power reorganization, as Mississippian culture entered a post-peak transitional phase.