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Federal government passes an act that designates the entire Great Plains as one enormous reservation, or land set aside for Native American tribes.
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Government changes policy and creates treaties that defines specific boundaries for each tribe.
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Chivington and his troops desended on the Cheyenne and Arapaho, who were camping at Sand Creek, killing over 150 inhabitants, mostly women and children.
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Crazy Horse ambushed Captain William J. Fetterman and his company at Lodge Trail Ridge. Over 80 soldiers were killed.
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Sioux agreed to live on a reservation along the Missouri River. This treaty was forced upon the learders of the Sioux.
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Colonel George A. Custer reported that the Black Hills had gold and that a gold rush was on.
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Led by Crazy Horse, Gall, and Sitting Bull, the warriors outflanked and crushes Custer's troops. Within one hour, Custer and all of his men in the Seventh Cavalry were dead.
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This act broke up the reservations and gave some of the reservation land to individual Native Americans. Government will sell the remainder of the land to the settlers.
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On this date, Custer's old regiment, the Seventh Cavalry rounded about 350 starving and freezing Sioux and took them to a camp at Wounded Knee Creek in South Dakota. The next day fighting broke out and within minutes, the Seventh Calvary killed 300 Native Americans.