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President John Tyler signs congressional relosution to annex Texas.
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President Polk sends John Slidell to Mexico to try to buy California and New Mexico from Mexico.
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Texas joined the Union in 1845, with Mexico breaking relations with the Union and later fighting many battles.
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US declares war on Mexico after they go onto our soil and shed blood.
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US army surrounds Mexico city and mexico surrenders.
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Mexico and the US sign the Treaty of Gualdalupe Hidalgo, establishing a new better border for the US.