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President John Tyler annexes Texas
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Polk sends John Slidell to Mexico to try to buy New Mexico and California. However when he gets there, President Herrera refuses to meet with him because he is afraid of being marked as a traitor.
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John Slidell leaves Mexico without seeing the Mexican President, which made the Mexicans and Americans on the brink of war. Therefore, General Taylor's Army marches into disputed territory claimed by both Mexico and the US.
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Polk asks Congress to declare war with Mexico and congress approves 10 million dollars and 50,000 volunteers for the war effort. Polk hopes the declaration will intimidate Mexico,
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Although Taylor's (American) troops were out numbered by 15,000 to 5,000, the Americans troops' firepower defeats the Mexican troops and sends them retreating towards the south. More than 3400 Mexicans lay dead or wounded.
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The Mexican President is stripped of military command and resigns his presidency, and flees to Jamaica.
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Negotiators sign treaty of Guadalupe Hidalgo, and the treaty is then rushed to DC to be ratified by the US Senate. The treaty then becomes ratified by both the US and Mexico.