Why do we know so little about the Harappans

The reason so little is known about the Harrappan Society is believed to be because of the invasion of the Indo-Europeans. They are known to have destructed the culture of the people in this society.

Explanation:

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it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries

answer; /// i believe that they became successful farmers; ///////////////