Answer:
Indus Valley Civilization, built along the Indus River
Explanation:
It was developed here because of the silt left behind from flooding, which allowed people to grow crops. The river would have brought many resources, such as food, like fish or other animals coming for a drink. It was also useful for irrigation.
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employed about 63 percent white, 25 percent black, and 12 percent Mexican or Mexican-American cowboys.