The Mariposa War (December 1850 – June 1851), also known as the Yosemite Indian War, was a conflict between the United States and the indigenous people of California's Sierra Nevada in the 1850s. The war was sparked by the discovery of gold in the region and the subsequent entry of miners into the Sierra Nevada foothills, which were traditionally occupied by the Ahwahnechee, a band of the Southern Sierra Miwok people. As miners began to take over the Ahwahnechee's land and resources, tensions escalated between the two groups.
The Ahwahnechee, led by their chief Tenaya, fought back against the miners, resulting in a series of skirmishes that escalated into a full-scale war. The California state government, under Governor John McDougall, responded by raising the Mariposa Battalion led by Sheriff James D. Savage to subdue the indigenous people. The military campaign involved multiple engagements across Mariposa County and surrounding areas as the Battalion pursued the Ahwahnechee and their allies.
The war ended in 1851 with the capture of Tenaya and the surrender of his band. As a result of the military expedition, the Mariposa Battalion became the first non-indigenous group to enter Yosemite Valley and the Nelder Grove. The Ahwahnechee were subsequently removed from their ancestral lands, marking a significant moment in the conquest of California's indigenous territories and the opening of previously unexplored regions to American settlement and development.
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.
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