The United Nations is an international organization founded in 1945 after the Second World War by 51 countries committed to maintaining international peace and security, developing friendly relations among nations and promoting social progress, better living standards and human rights.
The Declaration by United Nations was the main treaty that formalized the Allies of World War II and was signed by 47 national governments between 1942 and 1945. On New Year's Day 1942, during the Arcadia Conference, the Allied "Big Four" (the US, the UK, the USSR, and China) signed a short document which later came to be known as the United Nations Declaration, and the next day the representatives of 22 other nations added their signatures