--- title: "Formation of the United Nations" year: 1945 country: "United States" canonical: "https://recap.at/1945/united-nations-formed" slug: "united-nations-formed" recapType: "global_event" startDate: "1945-01-01" --- # Formation of the United Nations > San Francisco Conference established the UN as successor to League of Nations, reshaping post-war international governance. Fifty nations gathered in San Francisco on June 26, 1945, to sign the United Nations Charter, formally establishing an international organization designed to prevent another global war. Born from the ashes of World War II and the failed League of Nations, the UN represented humanity's most ambitious attempt yet at collective security and diplomatic problem-solving. ## Summary The history of the United Nations has its origins in World War II, beginning with the Declaration of St James's Palace. 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. Since then its aims and activities have expanded to make it the archetypal international body in the early 21st century. ## Key facts - **Signatory nations**: 50 countries signed the Charter on June 26, 1945 - **Conference location**: San Francisco Opera House, California - **Conference duration**: April 25 – June 26, 1945 (61 days) - **Permanent Security Council members**: 5 (United States, Soviet Union, United Kingdom, France, China) - **UN General Assembly members at founding**: 50 nations - **Roosevelt's role**: President Franklin D. Roosevelt championed the UN but died April 12, 1945, before signing - **First UN Secretary-General**: Trygve Lie, took office February 1, 1946 - **Charter ratification requirement**: Charter entered into force October 24, 1945, after ratification by permanent members ## Timeline - **1944-06-21** - Dumbarton Oaks Conversations begin US, UK, and Soviet Union meet in Washington, D.C. to draft proposals for the postwar international organization. - **1945-02-04** - Yalta Conference Roosevelt, Churchill, and Stalin agree on UN structure, including the veto power for Security Council permanent members. - **1945-04-12** - Franklin D. Roosevelt dies President Roosevelt, architect of the UN vision, dies in office; Vice President Harry Truman assumes presidency. - **1945-04-25** - San Francisco Conference opens United Nations Conference on International Organization convenes at the San Francisco Opera House with 50 nations. - **1945-06-26** - UN Charter signed All 50 delegates sign the United Nations Charter, formally establishing the organization to replace the League of Nations. - **1945-10-24** - UN officially comes into force The Charter enters into force after ratification by the permanent Security Council members and a majority of signatory states. - **1946-01-10** - First UN General Assembly meets The General Assembly convenes in London with delegates from all member states. - **1946-02-01** - Trygve Lie becomes Secretary-General Norwegian diplomat Trygve Lie takes office as the UN's first Secretary-General. ## Media coverage - **The New York Times** (1945-04-25): [San Francisco Conference Opens; 50 Nations Convene to Form United Nations Organization](Synthesized from period reporting - consult NYT archives) > The San Francisco Conference officially convened today with delegates from 50 nations gathering to draft the charter of a new international organization designed to maintain world peace and security. President Roosevelt's vision for a successor to the failed League of Nations took tangible form as representatives began preliminary sessions. - **The Times** (1945-06-26): [United Nations Charter Signed; New World Organization Born](Synthesized from period reporting - consult The Times archive) > Fifty-one nations today signed the United Nations Charter in San Francisco, formally establishing an international organization charged with preserving peace and security. Britain joined the United States and the Soviet Union as a permanent member of the Security Council, securing a leading role in postwar governance. - **Le Monde** (1945-06-27): [FR: 'La Charte des Nations Unies est signee' / EN: 'The United Nations Charter is Signed'](Synthesized from period reporting - consult Le Monde archives) > Synthesized from period reporting - France, restored to great-power status, joined the permanent Security Council as the charter took effect, ending four years of national humiliation and cementing the nation's role in the postwar order. - **Time Magazine** (1945-07-03): [One World: The United Nations Replaces League of Nations](Synthesized from period reporting - consult Time archives) > Synthesized from period reporting - With President Roosevelt's grand design now law, the United Nations emerged as humanity's boldest gamble against another world war, though skeptics questioned whether this new apparatus could succeed where the League had failed. - **Pravda** (1945-06-28): [RU: 'Sovetskii Soyuz v Organizatsii Obedinennykh Natsii' / EN: 'Soviet Union in the United Nations Organization'](Synthesized from period reporting - consult Pravda archives) > Synthesized from period reporting - The Soviet Union, as a founding permanent member of the Security Council, secured veto power over all major decisions, ensuring Moscow's central role in shaping the postwar world order. ## Impact The UN's creation marked a fundamental shift in how states approached conflict resolution and international law. Though it would inherit the League of Nations' structural weaknesses, the organization became the primary forum for geopolitical negotiation throughout the Cold War and beyond—flawed, often ineffective, but resilient. ## Sources - [Formation of the United Nations](https://en.wikipedia.org/wiki/History_of_the_United_Nations) - Wikipedia --- Canonical: https://recap.at/1945/united-nations-formed