US manufacturing of all kinds shifted to support the war effort. New
plants and shipyards were built nearly "overnight". Kaiser set the record
for building a "Liberty Ship" from start to finish in just over 4 days.
Pretty much EVERY "car company" in the U.S. contributed something to
the effort. It would be an interesting collection.
Try that today---not only is the manufacturing base in China, the war
would be over before the environmental impact statement was filed.