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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 ...
(Answer #1). The US entered World War I largely because of the German practice of submarine warfare. The entry of the US broke the stalemate that had existed for most of the war and led to the Allied victory.The US did not like the fact that Germany was using submarines to sink ships headed for England.The US had a huge amount of trade with England and did not like having this disrupted.he entry of the US broke the stalemate that had existed for most of the war and led to the Allied victory. The US did not like the fact that Germany was using submarines to sink ships headed for England. The US had a huge amount of trade with England and did not like having this disrupted.