>>23159639 (lb)
Treaty of Guadalupe Hidalgo (1848)
This treaty, signed on February 2, 1848, ended the war between the United States and Mexico. By its terms, Mexico ceded 55 percent of its territory, including the present-day states California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming. Mexico also relinquished all claims to Texas, and recognized the Rio Grande as the southern boundary with the United States.
The Treaty of Guadalupe Hidalgo, which brought an official end to the Mexican-American War (1846-48), was signed on February 2, 1848, at Guadalupe Hidalgo, a city to which the Mexican government had fled with the advance of U.S. forces.
With the defeat of its army and the fall of the capital, Mexico City, in September 1847, the Mexican government surrendered to the United States and entered into negotiations to end the war.
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The U.S. government paid Mexico $15 million "in consideration of the extension acquired by the boundaries of the United States" and agreed to pay American citizens debts owed to them by the Mexican government. Other provisions included the protection of property and civil rights of Mexican nationals living within the new boundaries of the United States, the promise of the United States to police its boundaries, and compulsory arbitration of future disputes between the two countries.
https://www.archives.gov/milestone-documents/treaty-of-guadalupe-hidalgo
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They lost the war and sold the land. If you sell your house you don't get to come back later and say that it's yours. You sold your rights to the land. This is common sense. I can see that like a lot of America's own government (local, state, and federal), Mexico's government is retarded.