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Texas accepts the US Congress' offer of annexation and joins the Union.
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Polk sends John Sidell to Mexico with instructions to buy Texas and California from Mexico.
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General Taylor's army marched south into the disputed land of Texas.
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After a request from President Polk, congress declares war on Mexico
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As part of his plan to cut off Northern Mexico, Taylor's army invades the city and defeats the forces of General
Pedro de Ampudia. -
The US army captures and occupies Mexico City.
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The Treaty of Guadelupe Hidalgo is signed by Mexican Negotiators and it is sent to Washington.
