The Sand Creek massacre occurred on November 29, 1864, during the Colorado Wars, a series of conflicts between the United States and Native American nations in the region. The attack took place against a backdrop of territorial disputes stemming from the Fort Laramie Treaty of 1851, which had recognized Cheyenne and Arapaho claims to vast lands in the territory.
A 675-man force of the Third Colorado Cavalry under Colonel John Chivington attacked a village of Cheyenne and Arapaho people in southeastern Colorado Territory. The assault resulted in the killing and mutilation of an estimated 70 to over 600 Native American people, though most sources estimate around 150 people were killed. Of those killed, approximately two-thirds were women and children. Chivington himself claimed that 500 to 600 warriors had been killed in the attack.
The Sand Creek massacre has since been recognized as a significant atrocity in American history. The location where the massacre occurred has been designated the Sand Creek Massacre National Historic Site and is administered by the National Park Service. The event is considered part of the broader series of conflicts known as the Colorado Wars, reflecting the violent confrontations that characterized U.S. military campaigns against Native American peoples during this period.
The Indian Wars encompass more than three centuries of armed conflict between the United States government, American settlers, and Indigenous nations — from the Powhatan Wars of the 1620s through the final Plains campaigns of the late 19th century. The eastern conflicts — King Philip's War (1675–1676), the Tuscarora War (1711–1715), and the Creek and Seminole Wars — largely ended organized Indigenous resistance east of the Mississippi by the 1840s. On the Great Plains, the Sioux Wars (1854–1890), Red River War (1874–1875), and Nez Perce War (1877) followed the displacement wrought by the transcontinental railroad and the near-extinction of the American bison — an estimated 30 to 60 million animals reduced to fewer than 1,000 by 1890. The Ghost Dance religious movement and the massacre at Wounded Knee (December 29, 1890), in which US cavalry killed approximately 250 Lakota men, women, and children, marked the effective end of armed resistance. The Dawes Act (1887) allotted reservation land to individual families, opening millions of acres to white settlement and reducing Indigenous landholdings by about two-thirds over the following decades.
Estimated 70 to over 600 Native American people killed; most sources estimate around 150 killed, approximately two-thirds women and children
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