ccb056 wrote:how did we win ww2?
Holy Moly - you don't know?
Are you aware of the maxim; "Those who do not understand history, are doomed to repeat it"?
FYI: you did not "win" WWII - you shared the win with the rest of the Western Allies. While your entrance into the war was very late, and you only came in, kicking and screaming AFTER Japan attacked Pearl Harbour, at least you came...
No, your history needs some brushing up, and your question has a very simple answer, which relates back to Pearl too: just after the attacks, when the Japanese fleet Admiral reported back to the Emperor, that he had only managed to catch 1 aircraft carrier in the surprise attack, and that two aircraft carriers and battle groups had not been sunk... He said, "I fear all we have done is awaken a sleeping giant."
Indeed, his words were prophetic, for the manufacturing might of the USA was brought to bear on the machines of war; in a manufacturing and engineering boom which was only ever matched by Russia moving its entire infrastructure up into Siberia - which eventually turned the tide against the Nazis in Russia.
I forget the exact numbers, but by the end of WWII the USA was churning out a simply staggering amount of war machinery: it was hundreds of planes a week, and hundreds of tanks; a battleship every month and an aircraft carrier every 2-3 months.
Additionally, the American manufacturers were not under any illusions about their hardware; it was designed and built to last only a few months, and no more.
This is where the Germans made a huge mistake, that literally could have cost them victory, or at least a stalemate; they insisted on engineering everythign as if it were going to last for 30 years.
Their tanks, which had an average life, towards the end of the war, of about 12 days in service, before being destroyed, were still being made by engineers as if they were going to be serviced, and re-serviced, and continue in battle for many years.
The extra cost in time, and money, and lost production, of being this fastidious meant that the supply of war machinery literally dried up. Without a constant and high supply of tanks and planes, the Nazi war machine could not operate.
Of course, Hitler's insanity, and stupidity of going into Russia and thinking he could be done with the place in 6 months was a crucial mistake as well, and there were many more - but the crux of the matter was the industrial gigantism of the US manufacturing base, which was turned towards the sole purpose of defeating Germany and Japan.
If I was a religious man, I would offer up a prayer that the US never has to do that ever again.