The Cayuse War (1847–1855) was an armed conflict between the Cayuse people of the Northwestern United States and settlers backed by the U.S. government. The conflict originated with the Whitman massacre of 1847, when the Cayuse attacked a missionary outpost in response to a deadly measles epidemic that they believed was caused by Marcus Whitman. The Whitman Mission had been established in 1836 by missionaries Marcus and Narcissa Whitman at Waiilatpu, six miles west of present-day Walla Walla, Washington, where they evangelized, established schools and grist mills, and introduced crop irrigation to the Cayuse Native Americans.
Following the Whitman massacre, the Provisional Government of Oregon and later the United States Army engaged in military operations against the Cayuse east of the Cascades over the subsequent years. The conflict represented a direct military confrontation between Native Americans and American settlers in the region.
The Cayuse War held significant historical importance as the first of several wars between Native Americans and American settlers in that region. The conflict ultimately led to negotiations between the United States and Native Americans of the Columbia Plateau, which resulted in the creation of several Indian reservations. This outcome established a pattern for future relations and territorial arrangements in the Northwestern territories.
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.
5 settlers killed; several Cayuse killed
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