Looking back, with industrial capacity like that, it’s no wonder we were able to crank out tanks, ships, and planes for WWII...
Even WITH the Depression...
The world had too much productive capacity. WW2 took care of that. War production ended much of the unemployent by initially sucking up most of the excess manpower (1940 Draft). But the utter destruction of Europe and the end of the colonial system allowed us to rebuild American prosperity unchecked — until roughly 1970.