The United Nations (UN) is an international organization of nations pledged to promote fundamental Human Rights, equal rights for men and women, world peace and security, maintain treaty obligations and the observance of international law, and cooperate in furthering social progress. The successor to the League of Nations, the United Nations stems from the 1941 Inter-Allied Declaration signed by representatives of 14 countries (not including the United States) and the Atlantic Charter signed by President Franklin D. Roosevelt and Prime Minister Winston Churchill of the United Kingdom.
In 1942, 26 countries met in Washington, D.C., and signed the Declaration by United Nations in a cooperative effort held by nations opposed to the fascist coalition of Germany, Japan, Italy, and their satellites. On June 25, 1945, delegates from 50 nations met in San Francisco and unanimously adopted the Charter of the United Nations.. The headquarters has been in New York City since 1946 and the current membership consists of 193 nations.
See Members States of the United Nations at www.un.org/en/members/