The correct answer is C.
The Treaty of Guadalupe Hidalgo was signed on February 2, 1848.
This Treaty ended the Mexican - American War in favor of the United States.
The war began two years earlier over a territorial dispute involving Texas.
As part of the Treaty, the United States gained additional territory, including the land of present-day Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming.
Mexico gave up its claims to Texas and recognized the Rio Grande as America's southern boundary.
