Question:

What happened to these ancient people who lived in the Indus Valley?

Answer:

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Nobody knows. Scientists think the Indus River may have changed its course and these people moved on. Perhaps it was war, or drought, or disease. What archaeologists have been able to discover so far is that this advanced civilization began building their cities along the Indus River about 4,500 years ago, and moved on or disappeared about 3,500 years ago. What happened to them is a history mystery. Daily Life in the Indus Valley Civilization