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In 1864 a regiment of colorado volunteers killed over 200 cheyenne along sand creek the cheyenne were waiting to work the terms of their surrender to military authority
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The treaty of medicine lodge creek in 1867 tried to force plains people to give up their authority as free nations and move to reserevations controlled by the federal government
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The "buffalo war" occurred in 1873-1874 is was the final attempt by several native american groups to protect the buffalo upon which they depended for food