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America's policy of isolation, and thus wanting stay out of any European affairs, while also trying to broker a peace resulted in tensions with both Berlin and London. When a German U-boat sank the British liner Lusitania in 1915, a large passenger liner with 128 Americans aboard, the United States President, Wilson, vowed "America was too proud to fight", and demanded an end to attacks on passenger ships. Germany complied. Wilson tried to mediate a compromise settlement; yet no compromise was discovered. Wilson also repeatedly warned that America would not tolerate unrestricted submarine warfare because it violated America's rights. Wilson was under great pressure from former president Teddy Roosevelt, who denounced German "piracy" and Wilson's cowardice. In January 1917 the Germans announced they would resume unrestricted submarine warfare. Berlin's proposal to Mexico to join the war as Germany's ally against the U.S. was exposed in February, angering American opinion. (see Zimmermann Telegram). After German submarines attacked several American merchant ships, sinking three, Wilson requested that Congress declare war on Germany, which it did on April 6, 1917.[11] The U.S. House of Representatives approved the war resolution 373-50, the U.S. Senate 82-6, with opposition coming especially from German American districts such as Wisconsin. The U.S. declared war on Austria-Hungary in December 1917. The United States was never formally a member of the Allies but an "Associated Power".
When Germany resumed unrestricted submarine warfare in early 1917 and made a clumsy attempt to enlist Mexico as an ally (see Zimmermann Telegram), Wilson took America into World War I as a war to make "the world safe for democracy." He did not sign a formal alliance with Great Britain or France but operated as an "Associated" power. He raised a massive army through conscription and gave command to General John J. Pershing, allowing Pershing a free hand as to tactics, strategy and even diplomacy.
Wilson had decided by then that the war had become a real threat to humanity. Unless the U.S. threw its weight into the war, as he stated in his declaration of war speech, Western civilization itself could be destroyed. His statement announcing a "war to end all wars" meant that he wanted to build a basis for peace that would prevent future catastrophic wars and needless death and destruction. This provided the basis of Wilson's Fourteen Points, which were intended to resolve territorial disputes, ensure free trade and commerce, and establish a peacemaking organization, which later emerged as the League of Nations.
To stop defeatism at home, Wilson pushed the Espionage Act of 1917 and the Sedition Act of 1918 through Congress to suppress anti-British, pro-German, or anti-war opinions. He welcomed socialists who supported the war, such as Walter Lippmann, but would not tolerate those who tried to impede the war or, worse, assassinate government officials, and pushed for deportation of foreign-born radicals.[20] His wartime policies were strongly pro-labor, though again, he had no love for radical unions like the Industrial Workers of the World. The American Federation of Labor and other 'moderate' unions saw enormous growth in membership and wages during Wilson's administration. There was no rationing, so consumer prices soared. As income taxes increased, white-collar workers suffered. Appeals to buy war bonds were highly successful, however. Bonds had the result of shifting the cost of the war to the affluent 1920s.
Wilson set up the United States Committee on Public Information, headed by George Creel (thus its popular name, Creel Commission), which filled the country with patriotic anti-German appeals and conducted various forms of censorship.