Yuma Crossing
Immediately after the Mexican–American War in 1848, the U.S. Army built Fort Yuma here to protect travelers from Indians raiding the area. It was the center point of conflict in the Yuma War of 1850–53. From 1864–1890, the fort and nearby facilities was the main army base to support the US Army's efforts to control the Indians throughout the greater southwest.
Yakima War
The Yakima War (1855-1858) was a conflict between the United States and the Yakama, a Sahaptian-speaking people of the Northwest Plateau, then part of Washington Territory, and the tribal allies of each. It primarily took place in the southern interior of present-day Washington, with isolated battles in western Washington and the northern Inland Empire sometimes separately referred to as the Puget Sound War and the Palouse War, respectively. This conflict is also referred to as the "Yakima Native American War of 1855."