Final answer:
The conflicts between Americans and Indigenous peoples on the plains from 1855 to 1890 were fueled by western settlement, land speculation, and government policies, resulting in violence, reservation confinement, and cultural shifts.
Explanation:
Conflicts between Americans and Indigenous peoples on the plains from 1855 to 1890 stemmed from various factors such as western settlement, land speculation, and government policies like forced migration. These conflicts led to violence, the confinement of Native Americans to reservations, and cultural changes.
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