The remains of the most sophisticated prehistoric native civilization north of Mexico are preserved at Cahokia Mounds State Historic Site. Within the 2,200-acre tract, located a few miles west of Collinsville, Illinois, lie the archaeological remnants of the central section of the ancient settlement that is today known as Cahokia.
Most people have heard of great South and Central American empires, but Mississippian civilizations are more obscure. At its peak, the Mississippian city known as Cahokia was bigger than London. So how did it get so big — and why was it abandoned?
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