In just the last few thousand years, massive civilizations have crumbled and disappeared... but why?? In this video, Unveiled looks at the Ancient Mayans, the Olmecs, the Indus Valley Civilization, the North American city of Cahokia and more... to discover why great societies rise and fall. read more...
Why Did These 8 Ancient Civilizations Mysteriously Collapse? | Unveiled
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VOICE OVER: Noah Baum
WRITTEN BY: Caitlin Johnson
