The peace Treaty of Guadalupe Hidalgo in 1848 ended the Mexican American War.
In the peace Treaty of Guadalupe Hidalgo, Mexico agreed to abandon claims to Texas, California, New Mexico, Nevada, Utah, and Colorado. Mexico recognized the Rio Grande as the southern boundary with the United States.
In return, the United States agreed to pay Mexico $15 million for the land and to withdraw its armies from Mexican soil.
The Mexicans owed American settlers and citizens $3.5 million for various claims. The United States agreed to pay these debts to the people on Mexico’s behalf.
The United States bought this huge and extremely valuable addition to its territory and increased the popular belief in the Manifest Destiny of the United States.
Mexicans living in the territory given by Mexico to the United States were promised U.S. citizenship. Mexican Americans were guaranteed "the right to their property, language, and culture."
The treaty included the promise of the United States to police its boundaries.
Source: 1848 Treaty of Guadalupe Hidalgo
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