The prominent figure associated with the concept of "self-determination" during World War I was Woodrow Wilson, the 28th President of the United States. His Fourteen Points proposed self-determination as a principle for resolving international conflicts and promoting peace. Wilson's advocacy for this concept aimed at empowering nations to govern themselves and achieve independence from imperial rule. While influential, the implementation of self-determination faced challenges in post-war treaties, exposing tensions between national aspirations and the geopolitical realities of the time, shaping future international relations.