Events Leading to WW1 By somer20 Jun 28, 1914 Gavrilo Pricip kills Archduke Fracis Ferdinand Archduke Francis Ferdinand and his wife, Sophia, made it to Sarajeveo. Both killed by a man named Gavrilo Princip. Jul 28, 1914 Germany declares war on Serbia Jul 29, 1914 Russia, as Serbia's protecter, readies its troops. Aug 1, 1914 Germany declares war on Russia Aug 4, 1914 Britain has been brought into war after invasion of Belgium Dec 31, 1914 The Ottoman Empire had been brought into war Mar 9, 1915 Italy had joined the Allies May 7, 1915 German opinions bitterd in America after sinking the Lusitania Mar 24, 1916 Germand U-Boat torpedoed the Sussex (A british cruise liner) Jan 31, 1917 Germany informed the US in would end the Sussec pledge. Feb 3, 1917 America broke off diplomatic relations with Germany. Period: Mar 6, 1917 to Mar 8, 1917 Germands sank 3 American ships City of Memphis, Illinois, and Vagilancia May 1, 1917 Starting in this time ships traveled in convoys. Mar 3, 1918 Germand forces attack British lines May 20, 1920 Congres decides to call the war officialy over Jul 2, 1921 Another joint resolution to end the war passed.