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

The United States President during World War I was Woodrow Wilson. He held office from 1913 to 1921 and is particularly noted for his leadership during the war, which lasted from 1914 to 1918. Wilson initially sought to maintain neutrality as the conflict began, but as the war progressed and after several provocations, he led the U.S. into the war in 1917. His administration not only focused on military involvement but also on post-war peace, culminating in his famous Fourteen Points speech that outlined his vision for a stable and peaceful world following the war.

The other choices reflect different time periods or contexts. Theodore Roosevelt served as president before the war, Harry S. Truman served after it, and Franklin D. Roosevelt was president during World War II. This context helps clarify why Woodrow Wilson is the correct choice regarding the leadership role he played during World War I.