Who were the first people to live in
the Indus river valley

The Indus Valley Civilization declined around 1800 BCE, and scholars debate which factors resulted in the civilization's demise. One theory suggested that a nomadic, Indo-European tribe called the Aryans invaded and conquered the Indus Valley Civilization, though more recent evidence tends to contradict this claim.

Explanation:

think its caste system

explanation:

answer; obey the closest relative's wishes;