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Actually, Mohenjo-Daro is one big mystery. Much of what we know (or think we know) about them is speculative, based solely on the artifacts and ruins of Mohenjo-Daro, Harappa, and dozens of other sites found in the Indus River Valley.
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The Aryan Invasion theory was first propounded when linguistic similarities between Sanskrit and the major European languages were discovered by European scholars during the colonial era.