About 1969, two years after I graduated from college, the front cover of a Machine Design magazine had the title, "Invented in Europe, Developed in America, Produced in Japan"! It was interesting how product evolution took place by crossing from one side of the earth to the other. Cameras were one of the examples cited.
Not only did pent up demand fuel manufacturing growth, but so did high taxes. Personal income taxes topped out at over 90% in the 50's and 60's. I don't know how high corporate taxes were, but they were up there. So, one way to avoid paying taxes was invest income in manufacturing facilities. Interesting contrast to much of current thinking about taxes. Also, ready access to and abundant supply of, raw materials such as iron ore helped spur growth. Eventually, by the 80's, low wages, no pollution controls, and easier recovery of iron ore made iron ingots cheaper to bring into Pittsburgh from Brazil than smelted from iron ore from Minnesota.