The League of Nations was an international organization established after World War 1 by Woodrow Wilson to preserve peace and settle disputes between member states from 1920 to 1945. It proved ultimately ineffective due to lacking an armed force to impose sanctions, slow decision making, being seen as a club for the victors of World War 1, and members undermining it by following their own agendas. However, in the 1920s the League was able to help return refugees, reduce diseases, stop slave labor and settle disputes between smaller member states.