The United Nations Organization (UNO) was founded in 1945 after World War II by 51 countries to maintain international peace and security. The UN is headquartered in New York City and is divided into six main bodies: the General Assembly, Secretariat, Security Council, Economic and Social Council, Trusteeship Council, and International Court of Justice. The General Assembly is the main policymaking body comprising 193 member states, while the Secretariat carries out the UN's daily operations under the Secretary General.