The Russians would have won regardless of what I or you think. Many argue, and not without reason, that Germany lost the war at the Battle of Moscow in 1941 before America even joined the war. There are a few interesting threads on that very subject if I remember correctly. I think Angus wrote a paper on the Eastern Front or something.
What a guy, that Stalin.
He already had the Nazis whupped and didn't need us, yet he graciously kept begging us to hurry and open a second front because he wanted us to share in his victory and have tremendous influence in post-war Europe.
How insulting for you to say the US role in defeating the Nazis was "insignificant."
Who pushed the German forces out of North Africa, Italy, France, Belgium, Luxembourg?
Not the Russians, but the British and Americans.
While the Russians might have won without us, they didn't have to and they hadn't had the war won before we got there. Tens of thousands of dead GI's prove that.
I'm guessing the war would have lasted much longer than 3 to 6 more months without our efforts and there would have been more like a few hundred thousand more dead Russians rather than just a few.