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about the un
united nations security council

The UN officially came into existence on 24 October 1945, after ratification of the United Nations Charter by the five permanent members of the United Nations Security Council and a majority of the other signatories.

A total of 51 original members (or founding members) joined that year; 50 of them signed the Charter at the United Nations Conference on International Organization in San Francisco on 26 June 1945, while Poland, which was not represented at the conference, signed it on 15 October 1945.

charter
the united nations charter preamble

WE THE PEOPLES OF THE UNITED NATIONS DETERMINED

To save succeeding generations from the scourge of war, which twice in our lifetime has brought untold sorrow to mankind,
To reaffirm faith in fundamental human rights, in the dignity and worth of the human person, in the equal rights of men and women and of nations large and small,
To establish conditions under which justice and respect for the obligations arising from treaties and other sources of international law can be maintained,
To promote social progress and better standards of life in larger freedom, and for these ends to practice tolerance and live together in peace with one another as good neighbours,
To unite our strength to maintain international peace and security, and
To ensure, by the acceptance of principles and the institution of methods, that armed force shall not be used, save in the common interest,
To employ international machinery for the promotion of the economic and social advancement of all peoples,

HAVE RESOLVED TO COMBINE OUR EFFORTS TO ACCOMPLISH THESE AIMS

On 25 April 1945, 50 governments met in San Francisco for a conference and started drafting the UN Charter, which was adopted on 25 June 1945 and took effect on 24 October 1945, when the UN began operations.

united nations members