The Mexican Cession was the relinquishment of more than half of Mexico’s territory to the United States under the Treaty of Guadalupe Hidalgo, which ended the Mexican-American War in 1848. The ceded territory covered more than 525,000 square miles (1,360,000 square km, or 336,000,000 acres) of land, including land that is now part of the U.S. states of New Mexico, Utah, Nevada, Arizona, California, Texas, Wyoming, Oklahoma, Kansas, and Colorado.
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