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…showed last 75 words of 375 total…made the 1st cotton cloth. Archaeologists have discovered many clay tablets, or flat writing pad, in the Indus River Valley. On them there were pictograms. About 1500 B.C. this civilization suddenly ended. The coastline changed so trading became harder. The monsoon might have failed, or maybe disease, an earthquake, or a flood struck. It might have been that the farmers could no longer grow enough food, or maybe the armies from the central Asia invaded.