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Why do many southwestern cities in the U.S. have Spanish names like Amarillo, El Paso, San Diego?
What is they were once a part of Mexico? At the conclusion of the Mexican-American War in 1848, Mexico lost more than 960,000 square miles of land, 55% of its national territory, including what is today California, Arizona, New Mexico, Utah, Nevada and parts of Colorado, Wyoming, Kansas, and Oklahoma.