From 1933 to 1944 Cordell Hull served as U.S. Secretary of State, steering wartime diplomacy alongside President Franklin D. Roosevelt. Seeking lasting peace after World War II, he envisioned a new international organization based on collective security. At the 1943 Moscow Conference he presented a plan for a ‘general international organization,’ which evolved into the Dumbarton Oaks talks. The resulting United Nations Charter included principles such as self-determination, human-rights respect, and the prohibition of force. Although illness kept Hull from the San Francisco Conference, his groundwork in drafting and negotiation was widely acknowledged. Today the UN, with 193 member states, conducts peacekeeping, humanitarian aid, and climate action. Hull’s emphasis on multilateral diplomacy marked a shift from bilateral deal-making to cooperative global governance. For these achievements, he alone received the 1945 Nobel Peace Prize.

Hull’s diplomatic vision was innovative in shifting the international order from 19th-century balance-of-power politics toward collective security. Building on the ‘Four Freedoms’ of the Atlantic Charter, he designed a postwar system coupling free trade with strengthened international law. At the Dumbarton Oaks Conference he led compromise formation among the U.S., U.K., USSR and China on issues such as permanent membership and veto power in the Security Council. Hull also ensured that the UN would include an Economic and Social Council and Trusteeship Council, elevating colonial and development questions to the same level as security. His Reciprocal Trade Agreements Act, promoting tariff reduction, dovetailed with this agenda and laid groundwork for GATT and eventually the WTO. From the standpoint of international-organization theory, Hull’s scheme corrected two major League of Nations flaws—unanimity and lack of enforcement—creating a more resilient institution. This robust design allowed the UN to endure through the Cold War as a venue for dialogue. Hull’s work is regarded as an early empirical case for regime theory and institutionalist approaches in international relations, influencing contemporary studies of multilateral treaty negotiations.

Hull’s negotiation strategy combined a functionalist incrementalism with a two-tier structure that accepted power-political realities. Granting veto power to the great powers in the Security Council satisfied Pareto optimality, while the General Assembly’s universal representation supplied legitimacy. During the 1944 Dumbarton Oaks draft, U.S.–U.K.–USSR legal interpretations clashed over Chapter VII enforcement triggers; Hull introduced the legal formulation distinguishing ‘provisional measures’ from ‘military action,’ enabling agreement. By linking Articles 24 and 25, he institutionalized the binding force of Security Council decisions even in peacetime, marking a departure from League-era collective-security clauses. His contemporaneous memoranda, archived as the Cloud Manuscript Collection at NARA, constitute primary material for institutional history. Theoretically, Hull’s design prefigures Ruggie’s concept of “multilateral mutualism” and is seen as a bridge to Keohane & Nye’s complex interdependence. Moreover, the RTAA linkage represents the prototype of the ‘trade-security nexus’ later formalized by Bown & Irwin, establishing coherence between the UN system and economic regimes.