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.
Utah War
In the end, the Utah War started a slow decline for Mormon isolation and power in Utah. The Latter-day Saints lost control of the executive branch and the federal district courts, but maintained political authority in the Territorial Legislature and the powerful probate courts. In 1869, the Transcontinental Railroad was completed, and soon large numbers of "Gentiles" arrived in Utah to stay. Despite this, complete federal dominance was slow in coming. Conflict between the Mormons and the federal government, particularly over the issue of polygamy, would continue for nearly 40 years before Utah was finally made a state in 1896, and was perhaps not fully resolved until the Smoot Hearings of 1904–1907.