In the 1870s, when gold was discovered in the blacks hills, the federal government first tried to
buy the territory from the american indians.
restrict all sioux indians to their reservation.
call on the us military to resolve the claims issue.
sign a new treaty with the area’s tribal chiefs.

Custer and the military units searched for a suitable location for a fort, civilians searched for gold, and it is disputed whether or not any substantial amount was found. Nonetheless, this prompted a mass gold rush which in turn antagonised the Sioux Indians who had been promised protection of their sacred land through Treaties made by the US government,[2] and who were later to kill Custer at the Battle of the Little Big Horn in the Great Sioux War of 1876–1877 between themselves and the United States.

A. buy the territory from the American Indians.

the right answer is d

i see, would you mind putting it as one?