Treaty of Guadalupe Hidalgo
peace treaty between the U.S. and Mexico that ended the Mexican–American War (1846–48). With the defeat of its army and the fall of the capital, Mexico entered into negotiations to end the war. The treaty called for the United States to pay $15 million to Mexico and pay off the claims of American citizens against Mexico up to $3.25 million. Most important it gave the United States the Rio Grande boundary for Texas, and gave the U.S. ownership of California, and a large area comprising New Mexico, Arizona, Nevada, Utah, and parts of Wyoming and Colorado.