//wiki.answers. com/Q /Wh lied_c ount ries _in _World_War_2
U.S., Great Britain (UK), Russia, Canada, China, Australia, France, were major Allies.
There were many more, including
Belgium (May 10 1940-invaded)
Greece (October 28 1940invaded)
Holland (May 10, 1940-invaded)
Norway (April 9, 1940 - invaded)
Poland (September 1, 1939- invaded)
Here is more related information:
* All the members of the British Commonwealth made independent decisions about joining or not joining in WWII. They also contributed greatly in both manpower and materials.
* In addition, I will mention a number of other nations that contributed to the outcome of WWII, either thru the use of their military forces, or thru the efforts of their expatriate volunteers - many of whom fought with the British forces: Poland, Norway, Belgium, Denmark, Holland, and Finland. Poland, for example had over 700,000 men in three separate Divisions, who fought under British direction in WWII. They fought well and in many different battles.
* The U.S. was by far the largest supplier of materials. The Russians had the most troops.
Thanks so much =]