Note that in Europe the economies are not as dynamic and has lower GDP growth on average. There are costs to higher taxes and more regulations. We're not exceptional, things are done differently.
This is definitely not true.
https://en.m.wikipedia.org/wiki/Socioeconomic_mobility_in_th...
It's been 80yr and Japan and Korea are doing fine.
The USSR basically force created a large single market over the course of its existence. If it was such a net win for prosperity the economic would have stuck around.