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. However, the Army attacked a different band led by Chief Heavy Runner, whom the United States government had previously promised protection. This tragic error demonstrated the consequences of military campaigns against Native American peoples during the Indian Wars period.
Major Eugene Mortimer Baker commanded the United States Army forces in this attack. The massacre resulted in the deaths of approximately 200 Native people, the majority of whom were women, children, and older men. The targeting of Heavy Runner's band, despite the government's prior promises of protection, represented a significant breach of trust and highlighted the vulnerability of Native American communities to military violence.
The massacre triggered substantial public outrage and catalyzed a long-term shift in federal policy toward what became known as the "Peace Policy," championed by President Ulysses S. Grant. In response to the incident and concerns about corruption within the Indian Affairs department, Grant maintained the Bureau of Indian Affairs as a division of the Department of the Interior, resisting the War Department's efforts to regain control. He subsequently appointed men recommended by various religious clergy, including Quakers and Methodists, as Indian agents, with the hope that their involvement would reduce the corruption previously found in the department. This policy shift marked a significant turning point in how the federal government approached its relationship with Native American tribes.
Indigenous peoples had inhabited North America for at least 15,000 years before European contact, developing complex societies across every region of the continent. The Mississippian culture, centered on the city of Cahokia near present-day St. Louis, reached its peak around 1100 AD with a population estimated at 10,000 to 20,000 — larger than contemporary London. The Ancestral Puebloans built multi-story stone complexes at Chaco Canyon and Mesa Verde between the 9th and 13th centuries. The Iroquois Confederacy, formed between roughly 1450 and 1600, united five nations under a constitution that influenced later American democratic thinking. Across the eastern woodlands, the Great Plains, the Pacific Coast, and the Southwest, hundreds of distinct nations maintained sophisticated trade networks, agricultural systems, and governance structures. European contact beginning in the late 15th century introduced epidemic disease — smallpox, measles, influenza — which devastated Indigenous populations by an estimated 50 to 90 percent within a century.
Approximately 200 Native people killed, most of whom were women, children, and older men
Pre-Columbian tribal groups — specific identities and numbers unknown; scale inferred from archaeological evidence
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