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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 ...
Rating Newest Oldest. Best Answer: There were two effects of America's entry. In the short term, America's entry very nearly caused a German victory. The Germans knew that once American troops arrived in force, they would overwhelm the Germans.Therefore they decided to launch one last massive offensive to gain victory before America could transport enough troops to Europe.n the Long term, America's entry had the opposite effect. Both sides were exhausted and the arrival of fresh, optimistic American troops gave Britain and France the extra incentive needed to gain an allied Victory. However, America did not bring about an allied victory.