The assassination of Archduke Francis and his wife leads to World War 1. The United States stayed neutral.
Nearly 1,200 people, including 128 American citizens died when a German submarine sank the Lusitania.
Avoiding the war, gets President Wilson reelected.
President Wilson asked for a deceleration of war against Germany, entering the U.S into the war. He could no longer back down from the war, after American lives were lost in the Lusitania and discovering about the Zimmerman telegram sent to Mexico from Germany.
An armistice ends the war on November 11, on the eleventh month, of the eleventh day, of the eleventh hour.
The senate reject the Treaty of Versailles. President Wilson worked so hard to try and get this treaty passed and continued to try and pass what he believed in until his death.