The pre-Columbian Mississippian culture established a capital city called Cahokia in Illinois near what is now Collinsville. This city disappeared in the 13th or 14th century for reasons unknown.
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replied to: jstack
epking
Replied to: The pre-Columbian Mississippian culture established a capital city called Cahokia in...
Another power in the area was the Illiniwek Confederation, from which the current state takes its name.