What would be the largest (in terms of countries) Sphere of Influence for the Western Allies post-WWII, both in Europe and in Asia, and how would that happen?
The whole of Europe, nay, the WORLD!
If the Soviets lose or are severely, much more severely than OTL, mauled, then there's no counterbalance to the WAllies. Unlikely, but still possible.
So you say the plan is to...take over the world?