It's always been this way. America has just been able to coast on being the only remaining major economy after WW2, and exploited the rest of the world instead. That exploitation of the rest of the globe has been mostly optimized now, so those shareholder returns are now coming at the expense of the 90% of Americans who aren't sitting at the table.
I think this is quite reductive. America certainly benefited from being one of 2 major powers after ww2. But unlike the USSR it invested in the world heavily. It rebuilt Allied and Axies manufacturing, and do a lot to revitalize the world economy. They got rich in the process but its not like they did nothing. They invented the internet and cure a ton of diseases. Setup a global order of trade that generates real prosperity.
I guess while I agree that American shareholders do reap incredibly benefits coasting is not really something america does. America is more than just shareholders too. You dont grow the world economy by coasting and you dont make up 25% of the world nominal GDP while only making up ~1/25 its population by coasting its inconsistent with reality.