The UN Charter mandates the UN and its member states to maintain international peace and security, uphold international law, achieve "higher standards of living" for their citizens, address "economic, social, health, and related problems", and promote "universal respect for, and observance of, human rights and fundamental freedoms for all without distinction as to race, sex, language, or religion".

[4] Pursuant to this goal, the UN Charter was discussed, prepared, and drafted during the San Francisco Conference that began 25 April 1945, which involved most of the world's sovereign nations.

[5] Following two-thirds approval of each part, the final text was unanimously adopted by delegates and opened for signature on 26 June 1945;[6][7] it was signed in San Francisco, United States, by 50 of the 51 original member countries.

The General Assembly formally recognized 24 October as United Nations Day in 1947, and declared it an official international holiday in 1971.

The second part of the preamble is a declaration in a contractual style that the governments of the peoples of the United Nations have agreed to the Charter and it is the first international document regarding human rights.

It set out (1) that these countries do not seek aggrandizement, (2) that no territorial changes be made against the wishes of the people, (2) the right to self-determination for all peoples, (3) restoration of self-government to those deprived of it, (4) furtherance of access for all states to trade and raw materials "needed for their economic prosperity", (5) global cooperation to secure better economic and social conditions for the world, (5) the "destruction of the Nazi tyranny" and freedom from fear and want, (7) freedom of the seas, and (8) "abandonment of the use of force" by disarming nations of "aggression" and establishing a wider Anglo-American world "security system" under mutual disarmament after the war.

[5] On 30 October 1943, the Declaration of the Four Nations, one of the four Moscow Declarations, was signed by the foreign ministers of the Big Four, calling for the establishment of a "general international organization, based on the principle of the sovereign equality of all peace-loving states, and open to membership by all such states, large and small, for the maintenance of international peace and security.

Pursuant to the Moscow Declarations, from 21 August 1944 to 7 October 1944, the U.S. hosted the Dumbarton Oaks Conference to develop a blueprint for what would become the United Nations.

[17] The subsequent Yalta Conference in February 1945 between the U.S., U.K., and Soviet Union resolved the lingering debate regarding the voting structure of the proposed Security Council, calling for a "Conference of United Nations" in San Francisco on 25 April 1945 to "prepare the charter of such an organization, along the lines proposed in the formal conversations of Dumbarton Oaks.

Article 26 In order to promote the establishment and maintenance of international peace and security with the least diversion for armaments of the world's human and economic resources, the Security Council shall be responsible for formulating, with the assistance of the Military Staff Committee referred to in Article 47, plans to be submitted to the Members of the United Nations for the establishment of a system for the regulation of armaments.

The Security Council shall lay down such conditions as it deems just for the participation of a state which is not a Member of the United Nations.Chapter VII includes the right to self-defence.