I'm not American. I did stay for months though in the US (SF, NY) and Europe (Italy, France, Greece, PT, DE, more) at times.

I think for competitive and talented people, US in general offers much more lucrative opportunities as long as you're OK with the US specific drawbacks. For non-competitive people, living in Europe would probably be a more convenient.

I think the problem though is in the future, both the US and Europe has grave societal and economic issues but from the different angles. Europe lacks economical drive and seems to discourage change on a cultural level. The US on the other hand seems to be an extreme catalyst.

I'm not familiar enough with quantitative data to judge on the compound interest, nevertheless I think in the last few decades we have already been witness on the global level to major changes in wealth: empires like UK have shrank, giants like China have risen. This had been very different a few decades ago and is an anecdote at least that compound interest can only do so much for empires, in the face of major changes.