The US would have won. Russian divisions where about half to a quarter size of regular army divisions(something we didn’t know at the time) effectively making their armies only about 50% larger than ours and Russia were almost entirely out of manpower. Add to that our domination of the air, the fact that we where supplying them with all the trucks, food, and gas needed to keep the USSR from collapsing we would have been to Moscow within a year.
Nukes wouldn’t have been a huge factor in this war because the production of the weapons wasn’t very fast at the time. We would have nuked maybe 2 or 3 Russian cities before the fight was over while our long range bombers would have destroyed Russian heavy industry within 6months using conventional attacks.
Patton would have won easy.
“and Russia were almost entirely out of manpower.”
I remember reading recently that 80% of the Russian males born in either 1921 or 1923 were dead by 1945.
That had to have a staggering effect on demographics.