World War 1

United States involvement

• U.S. was unable to remain neutral.
• German submarine warfare-sinking of the Lusitania.
• U.S. economic and political ties with Britain.

United States leadership as the war ended

• At the end of World War 1, President Woodrow Wilson prepared a peace plan that called for the formation of the League of Nations, a peacemaking organization.
• The U.S. decided not to join the League of Nations.

Allies

Great Britain

France 

Russia

Serbia

Belgium

Central Powers

Germany

Austria-Hungary

Bulgaria

Ottoman Empire