1848, peace treaty between the United States and Mexico that ended the Mexican War. Negotiations were carried on for the United States by Nicholas P. Trist. The treaty was signed on Feb. 2, 1848, in the village of Guadalupe Hidalgo, just outside Mexico City. It confirmed U.S. claims to Texas and set its boundary at the Rio Grande. Mexico also agreed to cede to the United States California and New Mexico (which included present-day California, Nevada, and Utah, and parts of Arizona, New Mexico, Colorado, and Wyoming) in exchange for $15 million and assumption by the United States of claims against Mexico by U.S. citizens. The treaty was ratified by the U.S. Senate on Mar. 10, 1848, and by the Mexican Congress on May 25.

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