Question

why is there no one definite reason for the decline of the Harappan civilization​

Answer 1

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Explanation:

Definite reason that led to the decline of the Indus Valley Civilization is not known, as no reliable resource of that period is available at present. Every conclusion regarding the decline is based upon speculations of historians. Though the reason of the decline is not known, but through excavations it is clear that fall of the Harappan Civilization occurred between 1800 BC to 1700 BC.

It is commonly believed that the Aryans were the next settlers. They were skilled fighters, so their attack might have led to the destruction of the Harappan Civilization. Even the epics of the Aryans mentioned about their victory over the great cities. The human remains found during excavation of Indus valley point towards some violent cause of their death. Now many historians, who do not believe this theory, say that the Aryans might not be involved in any such attack.