Comparing The Old United Nation's Human Development Index To The New One The United Nations is an international organization established immediately after World War 2 to maintain international peace and security and to achieve cooperation in solving international economic, social, cultural and humanitarian problems. The United Nation's Charter, which is the organization's governing treaty, was first drawn up in 1945 at a meeting held in San Francisco. The principle organs of the United Nations charter are the General Assembly, the Security Council, the Economic and Social Council, the trusteeship Council, the Intern