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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.
The Mexican-American War began on April 25th, 1846, when the Mexican cavalry attacked a group of U.S. soldiers in the disputed zone under the command of General Zachary Taylor, killing about a dozen. They then laid siege to an American fort along the Rio Grande. That's why the Mexican-American war happened.