| A | B |
|---|
| 28 June 1914 | Assassination of Archduke Franz Ferdinand in Sarajevo |
| Summer 1914 | The United States declares neutrality |
| Early 1915 | Germany steps up U-boat attacks on Allied shipping and declares a war zone around Great Britain |
| 7 May 1915 | The Lusitania is sunk- 128 Americans killed leading to the Arabic and Sussex Pledges |
| November 1916 | Election of 1916: Wilson (D) defeats Hughes (R)- "He Kept Us Out of War" |
| 1 February 1917 | Germany resumes unrestricted U-boat warfare |
| March 1917 | The Zimmerman Telegram propsoing a German-Mexican alliance is intercepted --> the U.S. breaks relations with Germany |
| 6 April 1917 | The United States declares war on the Central Powers |
| Summer 1917 | Selective Service Act, Espionage Act, War Industries Board formed, War Revenue Act formed |
| October-November 1917 | Lenin leads the Bolsheviks to power during the Russian Revolution |
| January 1918 | Wilson proposes the Fourteen Points |
| Spring 1918 | U.S. "Doughboys" start to make their presence felt in large numbers on the Western Front |
| Summer 1918 | U.S. troops intervene in the Russian Revolution to help the Whites against the Reds |
| 11 November 1918 | Armistice ends the fighting of World War I |
| January-June 1919 | Paris Peace Conference (Versailles Conference) |
| Late Summer-Fall 1919 | Wilson's pro-League of Nations tour (the "Solemn Referendum") ends in physical collapse |
| 1920 | The Republican-controlled Senate defeats the Versailles Treaty for the final time |
