The conflict between the Sioux nation and the united states was primarily driven by differing claims to land.
The Great Sioux War also referred to as the Black Hills War was a conflict which occurred in of 1876. It involved a series of battles and negotiations leading to the alliance of Lakota Sioux and Northern Cheyenne against the United States.
The cause of the war was primarily the US government trying to obtain ownership of the Black Hills. At that time, Gold had been discovered in the Black Hills, and settlers began to encroach onto Native American lands, and the Sioux and the Cheyenne adamantly refused to give up their land.
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