How did the United Nations?

The idea was during World War II, when coalition forces fired on the same United Nations, in 1942 the United Nations have agreed not to hold any separate treaty with Germany.

After the end of the war and the victory of the coalition conference was held in 1945 called the Conference Potsdam, and there will be converted into the nucleus forces the coalition to be the nucleus of the United Nations, which aims to prevent world wars, as well as prevent the formation of the roots of the emergence of ideas Kalnazih and find a body to prosecute criminals, and began Nations membership 15 countries, though it received the approval of 27 countries in the beginning.