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117: Forbidden Archaeology: Lost Giants of America | The Smithsonian's Biggest Secret

The Why Files: Operation Podcast

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The History of Diffusionism

Cyrus Thomas was director of the Eastern Mound Division at the Smithsonian. He thought it was impossible for savages from one side of the Mississippi to visit savages on the other side. Isolationism says that civilizations develop independently, and have very little contact with other civilizations. But when ancient mounds and pyramids in the Midwest were studied, they revealed a sophisticated culture.

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