zlacker

That seems rather focused on one policy that was big in the 50s. The Marshal Plan was great but that isn't something the modern US seems to be capable of - since around Vietnam I think was the change. It has been a good 50 years where the US just breaks stuff and leaves it broken.

Modern prosperity is caused by modern policy. I've seen some reasonable theorising that income basically comes from how easy it is to do business (thinking especially of https://www.grumpy-economist.com/p/the-cost-of-regulation). Which is linked in no small way to the cultural factors chgs pointed out - the most vibrant and high income industry in the world is also the one that sees laws impeding them as a problem that can be overcome.

The attitude of doing things that create wealthy even if NIMBYs object is an attitude that leads to wealth creation. Strange but true. Not the only factor, the political strength of the opposition matters a lot too.