Homes have increased their size by 300%+ since 1950 and the cost per square foot has remained relatively constant. We simply don't build enough smaller homes - they only exist on fringe and in urban centers where there the property costs increase the overall cost.
Edit: Also our overreliance on cars has only skyrocketed. More cars per household, more miles driven. When you are required to spend 20-30% of your income on a vehicle, homeownership gets harder.
Redlining continued to force black and brown people into less desirable parts of town even past the 50s. Many schools and public spaces were still legally segregated, and many banks wouldn't lend mortgages and employers wouldn't hire black or brown people
Car ownership rates were much lower then, as were college attendance rates. But yes, there were lots more good paying "blue collar" jobs with good benefits per capita due to the work of unions.
Also it helps that Europe was completely fucking devastated by World War II and that the United States had more factories than everyone else combined and was outside of bomber range. We dominated the world economy afterwards for literal decades because of that. What we're seeing in the late 20th century/early 21st century isn't some fantastical economic decline solely attributable to policy decisions or the war on organized labor (although it's a contributor) - it's rebalancing.
I'm going to say policies and decisions by executives to move jobs overseas actually had a ton to do with it. I also disagree that it's a rebalancing because this is not a zero-sum game, meaning the US does not have to give up prosperity for another country to gain prosperity.
