In which year did President Wilson declare war, leading to the US entry into World War I?

President Wilson declared war on Germany on April 6, 1917, marking the United States' official entry into World War I. Prior to this declaration, the U.S. had maintained a stance of neutrality, despite increasing tensions and provocations, including unrestricted submarine warfare by Germany and the Zimmermann Telegram. The decision to enter the war reflected a significant shift in U.S. foreign policy and was influenced by various factors, including economic interests and the desire to support Allies fighting against the Central Powers. Thus, the year 1917 is the correct answer, as it is the year when the U.S. took this pivotal step in the context of the global conflict.