It was no miracle we won. We had the man power, over 12 Million in uniform at the war’s end. We also had the industrial capacity and technology that we put to work to win.
A lot of things came together in a short period of time for us to win, hard work, innovation and a determination from a united country to do it. Today it probably would not happen.
We didn't have the hardware at the beginning. It was a Herculean effort on the home front to build the tanks, jeeps, planes, and ships that were necessary to win. Everybody pitched in. My late father in law (who was too old to serve) built airplane parts in his basement in Detroit after he'd worked all day at a GE subsidiary. However, we had next to nothing in the beginning and lost much of our existing fleet at Pearl.
I had an uncle who was just out of boot camp and stationed at Pearl when the bombing started, and I lost 2 other uncles (Anapolis grads) to the war before it was over.
There is no denying that we had a vast operating base and population removed from the actual war, yet able to interject ourselves into the war at our own choosing, that was something that it is easy to argue, made the result inevitable if we were committed.