Under the Limelight wrote:
The US banned other countries from lead participation since they were unprepared and had no army to speak of except for symbolic political prescence. The USSR were the true saviors of Europe from the Germans. The US merely tagged along. After WWII, Hollywood made movies falsely crediting the US as the victors when it was the USSR who saved humanity albeit with some limited US help.
This is absolutely true.
By the end of the war, there were 10 million Russians fighting 6 million Germans.
On the western front, there were about 2 million Allies (US, Canada, Britain, India, Aus, NZ, Poland) fighting 1 million Germans.