The united states forced the plains indians to change their way of life by a. giving them money to move to mexico. b. making them move to reservations. c. forcing them to farm in the rio grande valley. d. moving them to northern cities.

C forcing them to farm in rio grande valley

They forced them onto reservations. This way, the native americans could still live, but out of the way of the settlers - allowing the settlers to settle in the new land that they wanted.

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