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The United States later declared war on German ally Austria-Hungary on December 7, 1917. Germanyâs resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilsonâs decision to lead the United States into World War I. Following the sinking of an unarmed French boat, the Sussex, in the English Channel in March 1916, Wilson threatened to sever diplomatic relations with Germany unless the German Government refrained from attacking all passenger ships and allowed the crews of enemy merchant vessels to abandon their ships prior ...
The United States entered World War I because of a boat and a note. The boat was the Lusitania, which was sunk by German U-boats. This angered the Americans, but that was not what led them into the war.he United States declared war on Germany for many reasons. One of them was the sinking on neutral ships and the lusitania which killed about 148 Americans. This was not the immediate cause, another is propaganda which persuaded public opinion.