Who was the President of the United States during World War I?

Woodrow Wilson served as the President of the United States during World War I, which occurred from 1914 to 1918. He held office from 1913 to 1921 and was in power during the critical years when the U.S. entered the war in 1917. Wilson's presidency was marked by his strong advocacy for the League of Nations, which aimed at promoting peace and preventing future conflicts after the war. His leadership during this era focused on international diplomacy, and he is often credited with articulating a vision for a new world order based on democracy and self-determination. This makes him the correct answer, as his administration was directly involved in the United States' military and diplomatic efforts throughout the conflict.