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.
List of battles of the Mexican–American War
The Mexican–American War lasted from 1846 until 1848. It grew out of unresolved border disputes between the Republic of Texas and Mexico after the United States annexed Texas nine years after the Texas Revolution. It ended in 1848 with the Treaty of Guadalupe Hidalgo in which Mexico was forced to sell a vast tract of land that amounted to over half its national territory to the United States.