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  President John Tyler signs the Congress resolution to annex Texas, and Texas is now part of the union.
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  Polk draws the importance to expanding Americas land in his campaign for president.
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  Taylor's army marches into the south, into disputed territory.
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  Polk gets a letter from Taylor asking him to declare war on Mexico.
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  Taylor and his army go to the city and defeat the forces of General Pedro de Ampudia.
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  After the Battle of Mexico City, the US captured the city and took over it.
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  The peace treaty between Mexico and the United States was signed.