Usa During Word War 1

The United States so far had pursued a policy of isolation avoiding participation in the conflict whilst trying to broker a peace, this resulted in an increase in tensions with both Berlin and London. However, when a German U-boat sank the British liner Lusitania in 1915, a large passenger liner with 128 Americans also 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.[10] 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". Significant numbers of fresh American troops arrived in Europe in the summer of 1918, and they started arriving at around 10,000 men per day. Germany miscalculated that it would be many more months before large numbers of American troops could be sent to Europe, and that, in any event, the U-boat offensive would prevent