It’s amazing how many planes (and tanks, and ships) were built in that few year period — and what planes (and tanks, and some of the ships) didn’t get destroyed were scrapped before 1950. Just the scrapping effort dwarfs a lot of activity done before and since. :’) Just combat planes, the US alone built 236,305, kind of a lot, really.
http://en.wikipedia.org/wiki/United_States_aircraft_production_during_World_War_II
http://en.wikipedia.org/wiki/Military_production_during_World_War_II
Only in America.
It was and still is very impressive. When you get all Americans behind a task, you can do anything.