The Marias Massacre occurred on January 23, 1870, in Montana Territory as part of the United States Army's campaign to suppress Mountain Chief's band of Piegan Blackfeet. The massacre was carried out by U.S. Army forces under Major Eugene Mortimer Baker. A critical context for the engagement was that the U.S. Army attacked a different band led by Chief Heavy Runner, to whom the United States government had previously promised their protection, rather than targeting Mountain Chief's band as intended.
The massacre resulted in the deaths of approximately 200 Native people, most of whom were women, children, and older men. This indiscriminate killing of a protected band's non-combatants represented a significant violation of prior governmental commitments and military objectives.
The Marias Massacre produced substantial historical consequences, triggering public outrage that catalyzed a long-term shift towards a "Peace Policy" championed by President Ulysses S. Grant. In response to the massacre and broader concerns about corruption in Indian affairs administration, Grant maintained the Bureau of Indian Affairs as a division of the Department of the Interior, resisting the War Department's attempts to regain control. He appointed men recommended by various religious clergy, including Quakers and Methodists, as Indian agents, hoping to eliminate the corruption he had identified within the department.
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.
Approximately 200 Native people killed, most of whom were women, children, and older men
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