"In 1940, President Roosevelt, at the recommendation of Bernard Baruch, asked Knudsen to come to Washington to help with war production. Knudsen was appointed as Chairman of the Office of Production Management and member of the National Defense Advisory Commission, for which he received a salary of $1 per year."
"In January 1942, Knudsen received a commission as a lieutenant general in the U.S. Army, the only civilian ever to join the Army at such a high initial rank, and appointed as Director of Production, Office of the Under Secretary of War. In this capacity, he worked as a consultant and a troubleshooter for the War Department."
"In both of these positions, Knudsen used his extensive experience in manufacturing and industry respect to facilitate the largest production job in history. In response to the demand for war materiel, production of machine tools tripled. Total aircraft produced for the US military in 1939 was less than 3,000 planes. By the end of the war, America produced over 300,000 planes, of which the Boeing B-29 Superfortress benefitted greatly from Knudsen's direction. Production of both cargo and Navy ships also increased astronomically. Knudsen's influence not only smoothed government procurement procedures, but also led companies that had never produced military hardware to enter the market. America outproduced its enemies. As Knudsen said, "We won because we smothered the enemy in an avalanche of production, the like of which he had never seen, nor dreamed possible."
So in 1939 you had less than 3000 planes as i said... while germany had over 8000.... please you were nowhere near at being a superpower early ww2...
If germany had gone full force on the US on day 1 they cud have driven straight into the country and take it.