The key events that brought the United States into World War I was Germany's unwillingness to engage in a negotiated solution, German belligerence of the seas and declaring war on all ships in European waters,German submarine attacks on U.S. ships, and German attempts to push Mexico into war with the U.S. which was discovered through the Zimmerman telegraphs. There were many factors that led the U.S. to get involved and for President Wilson to ask Congress for a deceleration of war, but these were the main factors which led to the U.S.' entry into the Great War.
Key events leading to U.S. involvement in World War I include Germany's resumption of unrestricted submarine warfare, the interception of the Zimmermann Telegram, and the influence of the Russian Revolution. These events shifted public opinion and pressured President Wilson to ask Congress for a declaration of war, which was granted on April 6, 1917. As a result, the U.S. joined the Allied forces in the war.
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