I believe it was the 'big three' not four
Great Britain, USA, France, and Italy
The Big Three were the leaders of the three major Allied countries in World War II. They were Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin. You could consider their countries the Big Three, in which it would be the United States, United Kingdom, and Soviet Union.
Britain, Soviet Union, USA and China..
Great Britain, France, Russia, the USA entered in 1941