The United Nations (UN) was formed on October 24, 1945, after representatives of 50 countries met in San Francisco from April to June 1945 to complete the Charter of the United Nations. The UN was initiated by the leading states of the Allied States — the United States of America, Great Britain, and the Soviet Union — which sought to avoid future conflicts.
The UN Charter established the principles of international cooperation: sovereignty and equality of all members; settlement of international disputes by peaceful means; refusal to threaten or use force in international relations; and non-interference in matters that are essentially within the internal competence of any state.
The UN aims to promote and strengthen international peace and security, as well as support the development of cooperation between states.