We the Peoples of the United Nations

The Charter of the United Nations is the founding document of the Organization. It was signed on 26 June 1945, in San Francisco (USA), at the conclusion of the United Nations Conference on International Organization, and came into force on 24 October 1945. 

The United Nations can take action on a wide variety of issues due to its unique international character and the powers vested in its Charter, which is considered an international treaty. As such, the UN Charter is an instrument of international law, and UN Member States are bound by it. The UN Charter codifies the major principles of international relations, from sovereign equality of States to the prohibition of the use of force in international relations.