With that in mind, if you look at SPY (US) and compare it with EWI (Italy) and EWP (Spain), you will see that Italy and Spain are not going anywhere since 2008 and US at that time made huge progress.
https://www.marketwatch.com/investing/fund/spy
https://www.marketwatch.com/investing/fund/ewi
https://www.marketwatch.com/investing/fund/ewp
Now, take a look at GDP of US:
https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&...
And compare it with sad picture of Italy and Spain and Greece:
https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&...
US has populists but their debt denominated in their own currency and on top of that US economy is very diverse and strong. US is much more business friendly than Italy, Spain and Greece. And their debt denominated in currency they can't print.
If you are anti-business and pro-welfare, then your business won't flourish and at the same time you will accumulate huge debt.
In very long term, US is unsustainable. Too many states with different interests and huge moral hazard.
(Of course, I don't really believe this; I'm just showing you how your populistic generalizations can be equally applied to any federal state on the planet. Please try to see beyond the propaganda you are subjected to.)