Who was the U.S. President during World War I?

Woodrow Wilson was the U.S. President during World War I, serving from 1913 to 1921. His leadership during the war was significant as he initially sought to maintain neutrality but eventually led the country into the conflict in 1917, framing the war as a fight for democracy and peace. Wilson's administration is notable for his proposal of the Fourteen Points, which outlined his vision for a just peace and the establishment of the League of Nations, an international organization aimed at preventing future conflicts.

The other individuals listed were not presidents during this period. Theodore Roosevelt served prior to Wilson, from 1901 to 1909, and is well-known for his progressive reforms and foreign policy, but he was not in office during the war. Herbert Hoover, who became president later in 1929, was not directly involved in wartime leadership. Franklin Roosevelt, who served from 1933 to 1945, was president during World War II. Thus, Wilson's tenure aligns directly with the events of World War I, making him the correct answer.