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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 took place between 1846 and 1848, yet its roots can be traced to 1821, when Mexico gained independence from Spain. At that time, Mexico encouraged Americans to settle in its sparsely populated northern territory on the conditions that settlers convert to Catholicism and renounce slavery.