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President Tyler signs the resolution for the annexation of Texas
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Congress of Texas approves the U.S. resolution of annexation
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U.S. legislature approves a declaration of war against Mexico
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General Zachary Taylor invades the city of Monterrey to cut off Northern Mexico.The invasion was a success, and Congress uses this victory to aid in recruiting more troops.
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Although General Taylor's army was outnumbered 3 to 1, the armies' firepower defeats Santa Anna's troops, forcing the Mexicans to retreat south
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The U.S. army occupies Mexico City, essentially ending the war
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Final ratification of treaty is the official ending of the Mexican-American War