After WW2 almost every other developed nation was in ruin. The US was “the only game in town” when it came to production. This caused US labor to be in high demand and priced at a premium compared to places like in Europe or Japan, who were more concerned about rebuilding than exporting goods.
THIS is how a high school dropout could afford a house and a family. Because that high school dropout was basically your only option for labor. As those other countries finished rebuilding a lot manufacturing jobs left and things started to get “back to normal”.
The US was in a unique position but like most things it was just squandered. Now the US is “regressing towards the mean”. This is going to be the new normal because the last 40-50 years was an exception.