Climate Change and Migration Along a Mississippian Periphery: A Fort Ancient Example

Archaeologists have long recognized an important relationship between climate change and the trajectory of the Mississippian polity at Cahokia, with twelfth- and thirteenth-century droughts playing a key role in transforming social relationships and the pace of monument construction. This environmental transition may have spurred emigration from Cahokia and surrounding farming communities. This raises the questions: What was the nature of environmental change and cultural transformations on the Mississippian peripheries and where did these Mississippian emigrants go? This paper provides a case study from the Middle Ohio Valley that brings together spatiotemporal patterns in moisture availability between AD 1000 and AD 1300 and new archaeological data from Fort Ancient villages located in southeast Indiana and southwest Ohio that were occupied during this same temporal interval. We suggest that droughts in the American Bottom region pushed Mississippians to less drought-stricken areas such as the Middle Ohio Valley, which experienced concurrent periods of wetness. This pattern builds on a growing body of data suggesting that the movement of individuals and communities played a large role in the process of Mississippianization throughout the midcontinental and southeastern United States.