Obviously not, why do you think it is obvious?
Not even 2 decades before WW2, we 1v1d Russia and smacked them like little bit*ches. Germonkeys would meet the same fate if they fought us alone. Our army was just getting ready for another Miracle on the Vistula, we were set up to defend the Romanian Bridgehead and would undoubtedly crush the Nazi offensive there and then march straight to Berlin, but then Stalin invaded from the east and fuc*ked us.
I'm saying this as a renowned WW2 expert - I have over 500 hours in HOI4, and if you played it, you would very clearly see that beating Germany as Poland is relatively easy if you rush them early, the whole challenge is in getting to Berlin quick enough before Soviets finish justifying on you. Same the other way around, beating Soviets is easy if you don't have to worry about Nazis opening the second front. Knowing these facts, it's pretty much undeniable that Poland was the strongest WW2 power and only fell because Soviets and Nazis worked together against us.