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.
History of Washington (state)
The conflicts over the possession of land between the Indians and the 'American' settlers led the Americans in 1855, by the 'treaties' at the Walla Walla Council, to coerce not only the Cayuse, but also the Walla Walla and the Umatilla tribes, to the Umatilla Indian Reservation in northeastern Oregon; fourteen other tribal groups to the Yakama Indian Reservation in southern Washington State; and the Nez Perce to a reservation in the border region of Washington, Oregon and Idaho. That same year, gold was discovered in the newly established Yakama reservation and white miners encroached upon these lands. The tribes - first the Yakama, eventually joined by the Walla Walla and the Cayuse - united together to fight the Americans in what is called the Yakima War. The U.S. Army sent troops and a number of raids and battles took place. In 1858, the Americans, at the Battle of Four Lakes, defeated the Indians decisively. In a newly imposed 'treaty,' tribes were, again, confined to reservations.