Until 1917, the United States had tried to remain ____, not supporting either side. Germany's use of ____ warfare is what ultimately brought the United States into WWI. Sinking of the ____ brought the United States closer to joining the war in April 1917 November 11th, 1918, an ____, or agreement, to end the fighting was declared. President Woodrow Wilson's ____ offered a plan for peace based on justice, not punishment. The territorial losses, military restrictions and war guilt were all harsh provisions of the ____. Discovery of the ____ which proposed an alliance between ____ and ____ helped turn public opinion towards the U.S. joining WWI. The Treaty of Versailles differed from ____ because it was mainly concerned with ____ Germany. The assassination of ____ led to Austria-Hungary declaring war on Serbia which is considered the beginning of ____. The U.S. Senate refused to ratify the ____ because the Senate did not support U.S. participation in the ____.

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