Why did American automakers produce no cars between 1942 and 1945 during World War 2?

Americans produced cars, pickups, jeeps, carryalls, light trucks, etc, although they were not made with civilian purposes but with military purposes.

Car companies like Buick or Chrysler produced tanks, ford also produced the B 24 flying fortress, (more than 8000). Chevrolet produced trucks and gliders, Studebaker produced personnel carriers, etc. After the war, the first civilian car produced by Ford, was given to President Truman, by the company. it was a gray 1946 Ford Super Deluxe Tudor Sedan

Francisco Mejia-A

OCCC, Cali, Colombia.