Answer:
C. Settlers coming into conflict with tribes in the West.
Explanation:
And this conflict lasted into the 1850s. In response to the conflicts happening between the American Indians and the settlers in the west, Congress passed the first Indian Appropriations Act in 1851. This act created reservations, setting aside land for specific American Indian groups. It required tribes to confine themselves to these lands, and it granted tribes the right to govern themselves.
