Cahokia

c. 1050 – c. 1350 CE · about 300 years approximate dates

Cahokia was a Native American city of the Mississippian culture that existed from about 1050 to 1350 AD, across the Mississippi River from modern St. Louis. At its height around 1100 it covered about 6 square miles with around 120 earthworks. It was the largest and most influential urban settlement of the Mississippian culture.