The entire nation was mobilized for war, so the cost was high for sure. My point was that the US then could produce so much because their manufacturing sector w

The entire nation was mobilized for war, so the cost was high for sure. My point was that the US then could produce so much because their manufacturing sector was amazingly strong -- the same reason that Yamamoto Isoroku predicted, years before the US turned into a war machine, that Japan would lose to the US.