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Polk stresses the importance of expanding America in his campaign for president.
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After annexing itself from Mexico, Texas wanted security so it lobbied to join the US.
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Polk orders General Zachary to march to the Rio Grande
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In the hopes of intimidating Mexico, Polk asks Congress to declare war on Mexico.
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Despite being outnumbered 3 to 1, Taylor army defeats Santa Anna's troops through superior firepower.
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After continuous shelling of the Castle of Capultepec for 14 hours, American forces defeat the Mexicans. They take over the city the very next day.
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Mexican and American negotiators complete the Treaty of Guadalupe Hidalgo in which the US will recieve California and New Mexico as well as being able to keep Texas' borders for 15 million dollars.