World War 1 By Alyssa :) Period: 1870 to 1920 Causes and Consequences Of World War 1 Period: 1871 to 1913 Germany surpassed Britain to become Europe’s leading industrial power 1914 Germany defeats the Austrian Empire and France in war Jul 28, 1914 Austria-Hungary declared war on Serbia Aug 23, 1914 Japan declared war on Germany 1915 Italy joined Allies 1915 Germans begin using poison gas Period: 1915 to 1917 American Genocide May 7, 1915 The sinking of the British passenger ship Losilana 1917 Airplanes now being utilized to drop artilery 1917 Russias withdrawl from the war Apr 6, 1917 U.S. enters war 1918 Second Battle of the Somme Nov 11, 1918 War ended