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.
Provo Canyon Guard Quarters
The Provo Canyon Guard Quarters is an important historical site, preserving the conflict held during the Utah War, a bloodless standoff between the federal government and the LDS Church which lasted from 1857 to 1858. These guard quarters were one of three fortifications built by the Mormon people in response to the threat they perceived from the federal government during the Utah War. The Provo Canyon Quarters, due to its location, was not likely to be involved in any battles and was assigned a mere ten men to keep up the defenses. After the Utah War this fortification served as a station to observe Native American activity until the end of the Black Hawk Indian War in 1868, after which the Guard Quarters have served little purpose.