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President John Tyler of the US agreed with congress to annex Texas.
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President Polk sent Slidell to Mexico to buy California and New Mexico, but the Mexican Public found out so Slidell left without gaining California or New Mexico.
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President Polk sent General Taylor and his troops to claim a base near the Rio Grande River in newly annexed Texas.
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President Polk and Congress Declare war with Mexico, in addition Congress grants Polk $10 million and 50,000 volunteers to join the US force.
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General Taylor of the US won the battle; which was the first large battle between Mexico and the US.
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After 14 hours of the US attacking and the trouble of getting reinforcements, Mexico City surrendered.
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The US Senate ratified the treaty and then after about 2 months the Mexican Congress ratifies the treaty too.
