Wright, Hunter Imperialism Timeline 1820-1920 By Hunter.W.47 Sep 27, 1821 Mexico wins its independence from Spain. Jan 1, 1823 Mexico becomes a republic. Jan 1, 1861 Napoleon III sent French troops to overthrow Mexico's government. Jan 1, 1884 Berlin Conference The meeting of the major western powers of the world to discuss about the control of Africa. It lasted from 1884-1885. Jan 1, 1910 Porfirio Díaz was reelected as president of Mexico. Feb 22, 1914 Francisco Madero was executed. Jan 1, 1916 Pancho Villa launched an attack on Columbus, New Mexico when the U.S. recognized the government of Venustiano Carranza. Jan 1, 1917 Venustiano Carranza's new constitution went into effect in Mexico.