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The Mexican Revolution began on November 20, 1910 as an attempt to overthrow the rule of Mexican President Porfirio Diaz, who had been in power since 1877. Diaz stepped down and submitted to exile in 1911.
Polk, in turn, declared the Mexican advance to be an invasion of U.S. soil, and on May 11, 1846, asked Congress to declare war onMexico, which it did two days later. After nearly two years of fighting, peace was established by the Treaty of Guadalupe Hidalgo, signed on February 2, 1848.