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Cahokia is an archaeological site located in present-day Illinois, near the city of Collinsville. It was once the site of an ancient Native American city, which was the center of a pre-Columbian civilization known as the Mississippian culture. Cahokia flourished between the 9th and 15th centuries AD and was one of the largest urban settlements of its time in North America.

The Mississippian culture was characterized by the construction of large earthen mounds and a complex social, political, and religious organization. Cahokia was at the heart of this culture and served as a regional hub for trade, ceremonial activities, and political power. At its peak, the city is estimated to have had a population of between 10,000 and 20,000 people, making it one of the most populous cities in the world during its time.