Final answer:
The Mississippian tradition flourished in the central plains, on their western margins, and in what is now the eastern United States. This culture originated in the Mississippi River Valley and had a significant impact on the region through large-scale agriculture and specialized artisans.
Step-by-step explanation:
The Mississippian tradition flourished in the central plains, on their western margins, and in what is now the eastern United States, approximately 13,000 BP. This tradition originated in the Mississippi River Valley and encompassed a large area that spread to the lower Great Lakes region, the Carolinas, and northern Florida. The Mississippian culture emerged as agriculturalists practicing large-scale, corn-based agriculture and supported a dense population with specialized artisans.