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The federal government had passed an act that designated the entire Great Plains as one enormous reservation.
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The government changed its policy and created treaties that defined specific boundaries for each tribe.
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Massacre at Sand Creek.
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The warior Crazy Horse ambushed Captain William J. Fetterman and his company at Lodge Trail Ridge.
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The Sioux agreed to live on a reservation along the Missouri River, was forced on the leaders of the Sioux, by the Treaty of Fort Laramie
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War broke out again as the Kiowa and Comanche engaged in six years of raiding that finally led to the Red River War.
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Crazy Horse, Gall, and Sitting Bull outflanked and crushed Custer's troops. Custer and all of his men were dead within an hour.
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Congress passed the Dawes Act aiming to "Americanize" the Native Americans.
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The Seventh Cavalry-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