The Mexican Revolution began in 1910 in response to the authoritarian rule of Porfirio Díaz, who had been president for over 30 years. Díaz resigned in 1911 and was exiled to France. Francisco Madero then became president but was overthrown and killed in a coup led by Victoriano Huerta in 1913. This led to a civil war as revolutionaries like Pancho Villa, Emiliano Zapata, and Venustiano Carranza fought to overthrow Huerta. Carranza eventually assumed power in 1914 and a new constitution was adopted in 1917, but the revolution continued until 1920 when Alvaro Obregon became president, ending the civil war. The revolution brought some reforms but Mexico