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President John Tyler signs the Congresional resolution to annex Texas
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President Polk sends John Sidell to Mexico with instructions to try to buy New Mexico and California.
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General Taylor's army marches south, past the Nueces River toward the Rio Grande, moving into disputed territory claimed by both Mexico and the U.S.
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President Polk asks the US Congress to declare war on Mexico.
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General Taylor's army is outnumbered 15,000 to 5,000 but nevertheless, its firepower defeats Santa Anna's troops, and sends them retreating towards the south.
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Unable to get reinforcements, the Mexicans finally surrender. US troops capture and occupie Mexico City
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Negotiators sign Treaty of Guadalupe Hidalgo.
