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President Polk sends John Slidell to Mexico to attempt to purchase California and New Mexico from Mexican President Herrera.
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Texas joined the Union in 1845, with Mexico breaking diplomatic relations with the Union and later fighting multiple battles in the new state of Texas.
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President Polk moves troops to the Rio Grande to prepare for war.
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After a short debate Congress declares war on Mexico after they cross the US border and shed blood on US soil.
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US Army defeats Mexican Army of the North, pushing the Mexican army farther south.
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Mexico finally succumbs to US forces and surrenders the Mexican capital, Mexico City
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Mexico and the US sign the Treaty of Gualdalupe Hidalgo, establishing the new border and other negotiations.
