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Texas Congress accepts US's offer of annexation.
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President Polk sends Ambassador Slidell to Mexico to try to buy New Mexico and California.
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General Tyler's army marches south into the territory claimed by both Mexico and the US.
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President Polk receives a letter from General Tyler asking for congress to declare war. Congress approves a $10 million war budget, and 50,000 volunteers for the army.
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Tyler's army of 5,000 defeats Santa Anna's army of 15,000 and forces them to retreat south.
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US army occupies Mexico City.
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The treaty of Guadelupe Hidalgo was ratified by the U.S. Senate.
