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The history of the United Nations as an international organization has its origins in World War II. Taking up the Wilsonian mantle in 1944-1945, US President Franklin D. Roosevelt pushed as his highest postwar priority the establishment of the United Nations to replace the defunct League of Nations. Roosevelt planned that it would be controlled by the United States, Soviet Union, United Kingdom and China. He expected this Big Four would resolve all major world problems at the powerful Security Council. However the UN was largely paralyzed by the veto of the Soviet Union when dealing with Cold War issues from 1947 to 1989. Since then its aims and activities have expanded to make it the archetypal international body in the early 21st century.