USA – Cahokia Mounds State Historic Site

Around 1100 or 1200 A.D., the largest city north of Mexico was Cahokia, sitting in what is now southern Illinois, across the Mississippi River from St. Louis. Built around 1050 A.D. and occupied through 1400 A.D., Cahokia had a peak population of between 25,000 and 50,000 people.

Source: How White Settlers Buried the Truth About the Midwest’s Mysterious Mounds | Essay | Zócalo Public Square