President Wilson, serving as the 28th president of the United States from 1913 to 1921, was a key figure in shaping American foreign policy during World War I and the post-war period. His leadership emphasized the importance of democracy and self-determination, which influenced the U.S. role on the world stage and its emergence as a global power. Wilson's vision for a peaceful international order culminated in his Fourteen Points and the establishment of the League of Nations.