Mexican-American War (apr 25, 1846 – feb 2, 1848)

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The Mexican–American War, also known in the United States as the Mexican War and in Mexico as the Intervención estadounidense en México, was an invasion of Mexico by the United States Army from 1846 to 1848. It followed the 1845 American annexation of Texas, which Mexico still considered its territory.

President Polk and others saw the acquisition of Texas, California, Oregon, and other territories as part of the nation's Manifest Destiny to spread democracy over the continent. The U.S. also tried to buy Texas and what was called “Mexican California” from Mexico, which was seen as an insult by Mexico, before war broke out.

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