連合国共同宣言
Roosevelt's idea of the "Four Powers", referring to the four major Allied countries, the United States, United Kingdom, Soviet Union, and Republic of China, emerged in the Declaration by United Nations. On New Year's Day 1942, President Roosevelt, Prime Minister Churchill, Maxim Litvinov, of the USSR, and T. V. Soong, of China, signed the "Declaration by United Nations", and the next day the representatives of twenty-two other nations added their signatures. During the war, "the United Nations" became the official term for the Allies. To join, countries had to sign the Declaration and declare war on the Axis powers.