In the aftermath of World War II, the United States almost singlehandedly created the web of international institutions and organizations that comprise what is often referred to as the “liberal world order.” In the economic realm, American policymakers, working most closely with the British, designed what would become the International Monetary Fund and the World Bank. On trade matters, the United States considered plans for an International Trade Organization, although it ultimately designed and backed the less ambitious General Agreement on Trade and Tariffs. These efforts put in place international regimes and organizations that remain consequential today. But by far the highest-level American attention was reserved for the United Nations (UN), a new global organization designed to ensure future world peace and security.