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Which UNESCO World Heritage Site in Illinois contains the largest prehistoric earthen construction in North America?

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Correct answer: Cahokia Mounds

Cahokia Mounds represents the peak of the Mississippian culture, which thrived around 1050 to 1350 CE. At its height, this ancient city was larger than contemporary London, featuring over 120 earthen mounds. The largest, Monks Mound, rises 100 feet high and was built entirely by carrying baskets of soil by hand. Photo: Skubasteve834, Wikimedia Commons, CC BY 4.0.

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Source: Wikipedia (CC BY-SA)

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