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"They signalled the end of the traditional way of life for the Plains Indians" best explains the significance of the events at sand creek, Colorado, and at wounded knee, South Dakota, in the late 1800s.

The Sand Creek Massacre, also referred to as the Covington Massacre, the Battle of Sand Creek, or the Massacre of Cheyenne Indians, was a massacre of Cheyenne and Arapaho people by the American Army during the American Indian Wars that took place on November 29, 1864, when a 675-man force of the Third Colorado Cavalry led by U.S. Volunteers Colonel John Chivington attacked and destroyed a village of Cheyenne and Arapaho Chivington stated that between 500 and 600 warriors perished. However, the majority of reports suggest that there were roughly 150 fatalities, with about two-thirds of them being women and children.

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