Yuma War
The Yuma War was the name given to a series of United States military operations conducted in southern California and what is today southwestern Arizona from 1850 to 1853. The Yumans were the primary opponent of the United States Army, though engagements were fought between the Americans and other native groups in the region. Conflict generally took the form of guerrilla warfare, and, over the course of three years, the army engaged in pursuing unfriendly natives, protecting American settlers crossing the Colorado River and preventing conflict between the native tribes. A peace treaty in summer of 1853 was signed, ending hostilities between the Yuma and the United States, but it sparked a short war between the Yuma and the Cocopah. During the conflict, the historic Fort Yuma was constructed and became an important outpost on the frontier.
American Indian Wars
A number of wars occurred in the wake of the Oregon Treaty of 1846 and the creation of Oregon Territory and Washington Territory. Among the causes of conflict were a sudden immigration to the region and a series of gold rushes throughout the Pacific Northwest. The Whitman massacre of 1847 triggered the Cayuse War, which led to fighting from the Cascade Range to the Rocky Mountains. The Cayuse were defeated in 1855, but by then the conflict had expanded and continued in what became known as the Yakima War, 1855–1858. One of the triggers of the Yakima War was the creation of Washington Territory and the effort of its first governor, Isaac Stevens, to compel tribes to sign treaties ceding land and establishing reservations. The Yakama signed one of the treaties negotiated during the Walla Walla Council of 1855, and the Yakama Indian Reservation was established. The treaties were poorly received by the native peoples and served mainly to intensify hostilities. Gold discoveries near Fort Colville resulted in many miners crossing Yakama lands via Naches Pass, and conflicts rapidly escalated into violence. It took several years for the US Army to defeat the Yakama, during which time war spread to the Puget Sound region west of the Cascades. The Puget Sound War of 1855–1856 was triggered in part by the Yakima War and in part by the use of intimidation to compel tribes to sign land cession treaties. The Treaty of Medicine Creek, signed in 1855, established an unrealistically small reservation on poor land for the Nisqually and Puyallup people. Violence broke out in the White River valley, along the route to Naches Pass, which connected Nisqually and Yakama lands. Although limited in its magnitude, territorial impact and losses in terms of lives, the Puget Sound War is often remembered in connection with the 1856 Battle of Seattle and the execution of a central figure of the war, Nisqually Chief Leschi.