Mexican Revolution By svigh Nov 20, 1910 Díaz refused to allow clean elections, then Madero's calls for revolution were answered by Emiliano Zapata in the south and Pascual Orozco and Pancho Villa in the north. May 25, 1911 Profirio Diaz leaves for Europe Nov 1, 1911 Madero becomes president Feb 1, 1913 General VIctoriano Huerta becomes President Apr 22, 1914 U.S. troops occupy Veracruz Aug 20, 1914 Venustiano Carranza becomes president Mar 9, 1916 Pancho Villa attacks Colombus, New Mexico Mar 15, 1916 General Pershing invades Mexico Jan 1, 1917 The Zimmerman telegram Feb 5, 1917 Constitution of 1917 Approved May 1, 1920 Obregon overthrows Carranza
