1914 June- Arch-Duke Franz Ferdinand is assassinated July- Austria- Hungary declares War on Serbia August- Germany declares War on Russia and France August- Britain declares war on Germany Christmas Truce Poison gas is used for the first time May-The Lusitania is torpedoed by German U- boats May- Italy declares war on Austria- Hungary 1915
1916 February-Battle of Verdun Summer- U.S. declares Neutrality (still) March - Zimmermann telegram angers U.S. April- The U.S. declares war on Germany June- American Troops land in France 1917
1918 March- Russia withdraws from the war June- American expeditionary Force begin to Fight June- U.S. Victory at Belleau Woods Nov.- Armistice End of WWI June-Treaty of Versailles is signed 1919
1920 U.S. Senate rejects the Treaty of Versailles along with League of Nations U.S. signs a different peace treaty with the Central powers 1921