Final answer:
The Mississippian period reached its peak around 1250 CE, during the emergence of the large urban center of Cahokia near modern St. Louis. The Mississippian culture was characterized by large-scale corn-based agriculture, dense populations, and the construction of earthworks and burial mounds.
Step-by-step explanation:
The Mississippian period reached its peak around 1250 CE, during the emergence of the large urban center of Cahokia near modern St. Louis. At its height, Cahokia had a population of about sixteen thousand people and covered nearly four square miles. The Mississippian culture was characterized by large-scale corn-based agriculture, dense populations, and the construction of earthworks and burial mounds.