It always puzzles me when people point to a single 20-year period in world history, restricted to a single nation in extraordinary circumstance, as the baseline standard for societal performance.
1940's USA was under-utilized industrially at the outbreak of war. Government defense spending provided a huge economic infrastructure starting boost that allowed factories to be built, while every other industrial center (read: competitor) on earth was bombed into dust. Within it's wake, the US experienced a fluke ~17 years that have NEVER existed anywhere else, ever. Not only was no one available to compete on prices, but those would-be-rivals actually became buyers while rebuilding their own nations. By the later 1960's this was already "in decline" (IOW, returning to normal levels), and by the 1970's plenty of rivals had re-emerged.
Whenever I see people compare performance to this stretch, it reminds of some average guy happened to be walking past the limo right when the A-List starlet got out without underwear on ... and now uses that as his minimum acceptable woman on a dating app. It's insane.
No law known to humanity is going to make a typical high school graduate earn enough to purchase a decent brand-new home in the suburbs, buy his car outright (no loan), support a non-working wife and three children, plus go on vacations.
THIS is what that era saw commonplace. In any other era, this is pure fantasy.
P.S. I don't know which Union members people in this thread are talking to, but virtually everyone I know was forced out/into retirement as soon as they were eligible to make room for others. Plus, the new guys are getting paid less than new guys used to.
Also,
@Drenalin's experience about St. Louis matches my own. I had a buddy who's dad had the job of helping other Union members "vote right".