Unit VII: AP European By tmgarrison May 9, 1878 Congress of Berlin May 9, 1879 Triple Alliance formed May 9, 1888 Wilhelm II becomes kaiser May 9, 1890 Birth of nuclear physics; Start of American Progressive Era Period: May 9, 1895 to May 9, 1899 Dreyfus Affair Period: May 9, 1898 to May 9, 1900 Spanish American War Period: May 9, 1899 to May 9, 1900 Boer War May 9, 1900 Freud's The Interpretation of Dreams; Birth of modern volkism May 9, 1904 Russo-Japanese War May 9, 1905 Russian Revolution of 1905 May 9, 1907 Triple Entente formed May 9, 1914 Archduke Franz Ferdinand assassinated; World War I begins May 9, 1915 Italy enters the war May 9, 1917 U S enters the war; Russian Bolshevik Revolution May 9, 1918 Treaty of Brest-Litovsk; Americans enter the fighting; Armistice declared May 9, 1919 Versailles Treaty