US INVOLVEMENT IN WWI Causes of American Involvement • • • • 1. 2. 3. 4. Unrestricted Submarine Warfare British propaganda Zimmerman Telegraph Russian Revolution Unrestricted Submarine Warfare • Germany created new submarine called the ”U-Boat” • British blockaded North Sea, so Germany gave a “sink on sight” order to any ship approaching Britain • May 7th, 1915-British passenger liner the “Lusitania” sunk off the coast of Ireland • Killed 128 Americans The Lusitania Unrestricted Submarine Warfare • Aug. 1915 • The Arabic is sunk by the Germans • 2 Americans are killed Unrestricted Submarine Warfare • March 1916 • The Sussex, an unarmed passenger ship is sunk • America threatens to cut off diplomatic relations • Sussex pledge- no passenger or merchant ships would be sunk without warning British Propaganda • The British sent news of the war to US newspapers everyday • Full of Propaganda • Led the American public to be sympathetic toward the British British Propaganda British Propaganda British Propaganda British Propaganda British Propaganda Zimmerman Telegram • March 1917-British authorities gave to the US a telegram that was supposedly sent to Mexico from Germany • It had been decoded by the British • It asked Mexico to declare war on the US and they would be supported by Germany Russian Revolution • March 1917-Russia left WWI due to a Revolution in their own country • Germany now would concentrate totally on the Western Front • Pleas from Great Britain and France to join the war effort Declaration of War • April 2, 1917-Wilson asks Congress to declare war on Germany • “The World must be made safe for Democracy” • April 6th-Congress votes and declares war Selective Service Act • Authorized the federal government to raise a national army for the American entry into World War I through conscription (draft). *all males aged 21 to 30 were required to register for military service *By the end of World War I, some 2.8 million had been drafted.