Was it solely on the fact that there wew more Shermans or was there something else that gave the allies an edge over their enemies?
Not to stifle new answers, but this has been asked a number of times in the past. I'm of the opinion that this is the best of those threads.
Just ignore ChristianMunich.
Sadly, I'm unable to give credit to the user who has deleted his screenname for his excellent answers.