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President John Tyler admitts Texas into the union
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President Polk sent John Slidell to try to buy New Mexico and California from Mexico.
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General Taylor's army moved south into disputed territory
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President Plok asked Congress to declare war on Mexico. They approve and send 50,000 men and $10 million towards the war.
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The US won both the Battle of Palo Alto and the Battle of Resaca De La Palma, which drove the Mexican Army across the Rio Grande.
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US forces storm Mexico city and after 14 hours of defending the Castle of Capultepec, the Mexican Army suurenders.
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Negotiators sign the treaty, which gives the US Texas. the Rio Grande River was seen as the border from then on.
