The real miracle of WWII was the rapidity with which American industry switched from production of civilian goods to Military equipment at the beginning of WWII. Military vehicles from our automotive industry, firearms from everywhere including typewriter companies, uniforms from all over the textile industry. Armored vehicles even came from agricultural equipment builders and canning equipment makers. If a similar requirement arose today, the production facilities to convert from civilian to military items are mostly gone and the skill sets to run them are disappearing rapidly. Further many of the basic raw materials industries have all but disappeared. Examples would be the large production steel mills, textile industry, and the stockpiles of strategic materials like tungsten, manganese, chrome, cobalt, tin all of which we lack as a natural resource in significant quantities.
