The Treaty of Guadalupe Hidalgo ended the US-Mexican War in 1848. From this treaty the United States gained 500,000 square miles of territory and emerged as a major world power. However, the United...
Mexican American War.
February 2, 1848
It ended the border dispute and gave the US Alta California and Nuevo Mexico.
The United states got the land known as the Mexican Cession, but had to pay Mexico $15 million dollars, and also the border was set to the Rio Grande