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The federal government had passed an act that designed the entire Great Plains as one enormous reservation, or land set aside for Native American tribes.
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The government changed its policy and created treaties that defined specific boundaries for each tribe.
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Most of the Cheyenne, assuming they were under the protection of the U.S. government, had peacefully returned to Colorado's Sand Creek Reserve for the winter.
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The warrior Crazy Horse ambushed Captain William J. Fetterman and his company at the Lodge Trail Ridge.
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The Treaty of Fort Laramie, in which the Sioux agreed to live on a reservation along the Missouri River, was forced on the leaders of the Sioux
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Colonol George A. Custer reported that the Black Hills had gold 'from the grass roots down', a gold rush was on.
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The Sioux had Cheyenne held a sun dance, during which Sitting Bull had a vision of soldiers and some Native Americans falling from their horses.
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Congress passed the Dawes Act aiming to 'Americanize" the Native Americans.
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The Seventh Calvary- Custer's old regiment- rounded up about 350 starving and freezing Sioux and took them to a camp at Wounded Knee Creek in South Dakota.
