Who won WWII?

[Seamus Fermanagh]

...US biggest contribution was keeping Great Britain floating, it had little to do with the east front....

You are underestimating the importance of Great Britain's continued resistance to Soviet success. However marginal in total numbers when compared to the Eastern Front, the Med did draw resources, talent, and -- most importantly -- focus away from the East. Moreover, the resources expended on the War at Sea would have been re-channeled; Germany's parachutists could have been used as originally hoped to secure an airhead in some key locale during Barbarossa, etc.

To say the CCCP did the Lion's share is nothing more than fact, but don't go too far the other direction too quickly.