Treaty of Guadalupe-Hidalgo
After the United States won the Mexican War in 1848, the Treaty of Guadalupe-Hidalgo was signed. One main thing that it stated was that Mexico would permanently abandon all claims to Texas. The treaty also stated that the boundary between Texas and Mexico would be officially set at the Rio Grande. Third, Mexico said that it would surrender the Mexican Cession (all territory between Texas and the Pacific Ocean) to the U.S. The United States then paid Mexico $15 million for the territory. Finally, the U.S. paid all of the legal claims of Americans against Mexico.