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The United States Declares War
Key Terms
• U-boat• Sussex pledge• Zimmermann note• Russian Revolution
German Submarine Warfare
• The use of German submarine warfare frustrated many Americans– Called U-boats• New weapon that changed the rules of naval warfare
• Battle of Jutland tried to break the stalemate of Germans and the British– Passenger and merchant ships had no defense
against the submarine
Sinking of the Lusitania
• May 7, 1915 is when a U-boat sighted the Lusitania– Wilson demanded that
Germany stop its submarine warfare• U-boats continued to
torpedo Allied ships• Sussex Pledge was a
promise that U-boats would warn ships before attacking
Moving Toward War
• Wilson ran for reelection on the slogan “He kept us out of war”
• Germany went against the Sussex pledge– On February 3, the United States broke off diplomatic
relations with Germany• Wilson then asked Congress for permission to arm American
merchant ships
• Zimmerman note was intercepted– Germany made a secret offer to Mexico
• Mexico would get land in America if they would attack America
Revolution in Russia and the War Resolution
• Russia had already suffered enormous casualties in the war– Czar Nicholas II was forced to give up the throne• Monarchy was replaced by a republic• Called the Russian Revolution
• Germans sank three US ships in three days– War resolution passed 82 to 6• Wilson signed it on April 6, 1917
Questions to Consider
• What was the naval battle called between the British and the Germans?
• What is the Zimmerman Note?• Why was the sinking of the Lusitania not a
good reason to go to war?• http://www.history.com/topics/world-war-i/vi
deos#u-boats-sink-the-lusitania-in-1915• http://www.history.com/topics/world-war-i/vi
deos#world-war-i-germans-attack-us-navy-boats