What happened c. 1500 BCE?Archaeologist says that floods could have caused the decline of the Indus Valley Civilisation and these floods would have destroyed the irrigation systems that people depended on for their farming. Other people thinks that the flood might have bred mosquitoes which led to outbreaks of malaria. Plus, the decline was almost certainly speeded up by the invasion of the Indus Valley by a group of Aryans. The Indus Valley Civilisation ends like that. This evidence was written in a textbook, secondary source.
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