President Woodrow Wilson had a vision of a postwar world that would be more peaceful, democratic, and cooperative than the prewar world. This vision was embodied in his Fourteen Points, a speech he gave to the U.S. Congress in January 1918, in which he outlined his vision for the postwar world.
Wilson's Fourteen Points included proposals for free trade, disarmament, and the creation of an international organization to prevent future wars. He also called for the self-determination of nations, meaning that countries should be able to choose their own form of government and not be subject to the control of other nations.
However, the Senate refused to endorse Wilson's vision for several reasons. First, many senators were skeptical of the idea of an international organization, which would involve surrendering some degree of national sovereignty. Second, they were concerned about the potential cost of participating in an international organization and feared it would lead to greater U.S. involvement in international affairs.
Additionally, many senators disagreed with Wilson's advocacy for self-determination, arguing that it was hypocritical given the history of U.S. imperialism and territorial expansion. Some senators were also concerned about the potential impact of Wilson's proposals on the balance of power in Europe.
Overall, the Senate's rejection of Wilson's vision for the postwar world was a significant setback for him and contributed to the U.S. not joining the League of Nations, which was established after World War I to promote international cooperation and prevent future wars.