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John Slidell went to Mexico to negotiate a deal with Mexico in which the US would pay $25 million for California, and Mexico would agree to the Rio Grande border for Texas. The Mexican government refuses to see him. He left just before war began in March.
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General Taylor marches his army past the Nueces River to the Rio Grande river, which the US claims is the border.
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President Polk advises Congress to declare war on Mexico.
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US defeats Mexico at the Battle of Monterey
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The US Army under General Winfield Scott occupies Mexico City. General Santa Anna leaves the city with his army to plan their next move, but politicians in the city surrender the city to the US.
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The treaty is signed by both parties, and it is later ratified by the US Senate.
