Who was President during World War I?

The President during World War I was Woodrow Wilson. He served as the 28th President of the United States from 1913 to 1921, a period that encompassed the entirety of the United States' involvement in the war, which lasted from 1917 to 1918. Wilson played a crucial role in international diplomacy during and after the war, advocating for the League of Nations and promoting his Fourteen Points as a basis for peace. His vision sought to address the underlying causes of conflict and create a framework for future international cooperation. This leadership during such a pivotal moment in history significantly shaped global politics in the 20th century and demonstrated the United States' emerging role as a world power.

The other figures mentioned held office at different times and were not involved in World War I: Theodore Roosevelt was President before Wilson, Herbert Hoover and Calvin Coolidge served afterward during the 1920s and 1930s.