Canada, United States, and the United Kingdom were the main ones, but there was a bunch of help/support from numerous other countries.
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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.
The countries most commonly viewed as the big three were Britain, France and Germany.
The Allied Forces Big 3 were the USA, England and the now defunct Soviet Union.
U.S., Great Britain, and the Soviet Union.
Germany was not one of the Big-3. France, US, and Britain were.