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The Plains Peoples were most likely to be:

Farmers.

Explanation:

The Plains Peoples were most likely to be farmers because of the flat geography and the presence of water for agriculture. There are many rivers and streams are present which provides water for the cultivation of crops. The soil of these plains are more fertile due to the presence of river nearby which is very suitable for growing food crops so that's why Plains Peoples were chose the profession of farming of crops as well as animals.

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