Great Britain and France were the first to form the Allied forces during World War II.
The Allies of World War II, called the "United Nations" from the 1 January 1942 declaration, constituted the countries that together opposed the Axis powers during the Second World War (1939–1945). The Allies promoted the alliance in an attempt to control German, Japanese and Italian aggression.
The major Allied powers in World War I were Great Britain (and the British Empire), France, and the Russian Empire.
