The first Mexican residents of the U.S. did not immigrate, but were brought into the U.S. as a result of the Mexican-American War of the 1840s.

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The Mexican-American War (1846-1848) led to the U.S. acquiring territories that are now part of the southwestern United States. People living in these territories, who were originally Mexican citizens, became U.S. residents as a result of the war and the Treaty of Guadalupe Hidalgo, without having to move or immigrate in the traditional sense.

The First Mexican Residents of the U