The assassination of Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife Sophie, Duchess of Hohenberg, occurred on 28 June 1914 in Sarajevo when they were mortally wounded by Gavrilo Princip.
Russia and Germany peace treaty
Germany invades Belgium on August 4, 1914 beginning of the war.
Congress allows a declaration of war against Germany. The U.S. enter World War 1 on the side of France and Britain on April 6,1917
The Germans sign a peace treaty with the new Bolshevik government of Russia on March 3, 1918.
A truce is signed ending fighting on the Western Front on November 9,1918.