12 June 1941 — The Declaration of St. James's Palace in London
In June 1941, representatives of Great Britain, Canada, Australia, New Zealand, the Union of South Africa, and the exiled governments of Belgium, Czechoslovakia, Greece, Luxembourg, the Netherlands, Norway, Poland, Yugoslavia and General de Gaulle of France signed the Declaration
1944–1945 — Dumbarton Oaks and Yalta
The principles of the organization-to-be were thus laid down. But it was a long step from defining the principles and purpose of such a body to setting up the structure. A blueprint had to be prepared and accepted by many nations.
30 October 1943 — Moscow and Teheran Conference
In Moscow, the Soviet Union, the United Kingdom, the United States and China call for the establishment of an international organization to maintain peace and security - a goal reaffirmed two months later in Teheran.
1 January 1942 — The Declaration of the United Nations
Representatives of 26 countries fighting the Rome-Berlin-Tokyo Axis, decide to support the Atlantic Charter by Signing the Declaration of the United Nations.
14 August 1941 — The Atlantic Charter
Two months after the London Declaration came the next step to a world organization, the result of a dramatic meeting between President Roosevelt and Prime Minister Churchill aboard a ship.
San Francisco Conference — 1945
Forty-five nations, including the four sponsors, were originally invited to the San Francisco Conference: nations which had declared war on Germany and Japan and had subscribed to the United Nations Declaration.