In short
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.
How it unfolded.
The five-minute version
What actually happened.
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.
As it was happening
13 voices, 590 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Dumbarton Oaks Conversations begin
US, UK, and Soviet Union meet in Washington, D.C. to draft proposals for the postwar international organization.
Voices from this moment (1)
Dumbarton Oaks Conversations begin
Jun 21
“US, UK, and Soviet Union meet in Washington, D.”
As it was happening
13 voices, 590 days.
Day 0 · June 21, 1944
Dumbarton Oaks Conversations begin
US, UK, and Soviet Union meet in Washington, D.C. to draft proposals for the postwar international organization.
“US, UK, and Soviet Union meet in Washington, D.”
- Dumbarton Oaks Conversations begin, Jun 21
Day 228 · February 4, 1945
Yalta Conference
Roosevelt, Churchill, and Stalin agree on UN structure, including the veto power for Security Council permanent members.
“Roosevelt, Churchill, and Stalin agree on UN structure,…”
- Yalta Conference, Feb 4
Day 295 · April 12, 1945
Franklin D. Roosevelt dies
President Roosevelt, architect of the UN vision, dies in office; Vice President Harry Truman assumes presidency.
“President Roosevelt, architect of the UN vision, dies in…”
- Franklin D. Roosevelt dies, Apr 12
Day 308 · April 25, 1945
San Francisco Conference opens
United Nations Conference on International Organization convenes at the San Francisco Opera House with 50 nations.
“San Francisco Conference Opens; 50 Nations Convene to Form…”
- The New York Times, Apr 25
“United Nations Conference on International Organization…”
- San Francisco Conference opens, Apr 25
Day 370 · June 26, 1945
UN Charter signed
All 50 delegates sign the United Nations Charter, formally establishing the organization to replace the League of Nations.
“United Nations Charter Signed; New World Organization Born”
- The Times, Jun 26
“FR: 'La Charte des Nations Unies est signee' / EN: 'The…”
- Le Monde, Jun 27
“RU: 'Sovetskii Soyuz v Organizatsii Obedinennykh Natsii' /…”
- Pravda, Jun 28
“One World: The United Nations Replaces League of Nations”
- Time Magazine, Jul 3
“All 50 delegates sign the United Nations Charter, formally…”
- UN Charter signed, Jun 26
Day 490 · October 24, 1945
UN officially comes into force
The Charter enters into force after ratification by the permanent Security Council members and a majority of signatory states.
“The Charter enters into force after ratification by the…”
- UN officially comes into force, Oct 24
Day 568 · January 10, 1946
First UN General Assembly meets
The General Assembly convenes in London with delegates from all member states.
“The General Assembly convenes in London with delegates from…”
- First UN General Assembly meets, Jan 10
Day 590 · February 1, 1946
Trygve Lie becomes Secretary-General
Norwegian diplomat Trygve Lie takes office as the UN's first Secretary-General.
“Norwegian diplomat Trygve Lie takes office as the UN's…”
- Trygve Lie becomes Secretary-General, Feb 1
The numbers.
3 numbers that anchor the scale.
By the numbers
The countable parts.
Signatory nations
0 countries signed the Charter on June 26, 1945
Permanent Security Council members
0 (United States, Soviet Union, United Kingdom, France, China)
UN General Assembly members at founding
0 nations
Front pages.
3 outlets carried the story: The New York Times, The Times, Le Monde.
Media coverage
What the world was reading.
5 pieces, ranked by how much they shaped the discourse.
The New York Times
Newspaper · United States · Apr 25, 1945
"San Francisco Conference Opens; 50 Nations Convene to Form United Nations Organization"
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.
- Jun 26, 1945
The Times
Newspaper · United Kingdom
"United Nations Charter Signed; New World Organization Born"
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.
- Jun 28, 1945
Pravda
Newspaper · Soviet Union
"RU: 'Sovetskii Soyuz v Organizatsii Obedinennykh Natsii' / EN: 'Soviet Union in the United Nations Organization'"
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.
- Jun 27, 1945
Le Monde
Newspaper · France
"FR: 'La Charte des Nations Unies est signee' / EN: 'The United Nations Charter is Signed'"
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.
- Jul 3, 1945
Time Magazine
Magazine · United States
"One World: The United Nations Replaces League of Nations"
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.
Captured in time.
Captured before it changed
The web as it looked, the day it happened.
Wayback Machine snapshots of the pages people actually loaded that day. Click any card to open the archive at full size.
Sources & citations.
Sources
Where this came from.
Every claim on this page traces to a public, license-clean source. We don't asterisk well.
Wikipedia
1 source- 1.Formation of the United Nations
en.wikipedia.org