1. U-Boats Woodrow Wilson’s plan for peace following the war Didn’t want to fight; captured 132 prisoners; killed 25 by himself Isolationism Henry Cabot Lodge Made fighting stationary; easy to defend position Organization formed to keep world peace Opposed US joining League of Nations Causes of WW I Zimmerman Telegram Trench warfare Battle of Argonne Forest Nationalism, Imperialism, economic rivalries, alliance system, militarism Tanks Opened a hole in German lines Treaty of Versailles Were used in WW I, but too primitive to be effective

2. Payment for causing WW I paid by Germany Ship sunk by German submarine Peace terms ending WW I New weapons used in WW I Lusitania Germany promised not to sink any ships without warning Germany lost territory; dividing of Austria-Hungary and Turkey; Germany punished; League of Nations Said that there are limits to free speech Fourteen Points Archduke Franz Ferdinand Sussex Pledge Allowed government to draft men to serve in war Assassinated; spurred beginning of WW I Alvin York Selective Service Act Ended WW I

3. US troops led by John J. Pershing Other reasons for US entry into WW I American Expeditionary Force Total war Closer ties with Allies, German actions, British blockade Atlantic Ocean Using all of a country’s resources in a conflict League of Nations German unrestricted submarine warfare Geographic feature that kept US from attack on mainland Country separating itself from others’ affairs Main reason for US entry into WW I Promised Mexico land in US to help Germany fight against US

4. Machine guns, poison gas, submarines, airplanes reparations Schenck vs US German submarines used to attack large ships