(1856–1924), 28th president of the US 1913–21; full name Thomas Woodrow Wilson. A Democrat, he eventually took the US into World War I in 1917 and later played a leading role in the peace negotiations and the formation of the League of Nations. The Senate, however, failed to ratify the peace treaty. Semi-incapacitated by a stroke in 1919, he did not seek re-election. Nobel Peace Prize (1920).