There is an enormous difference, though: internal mobility/identity.
Germans tend to strongly prefer living in Germany. Greeks tend to strongly prefer living in Greece.
People in Oregon and New Hampshire tend not to have very strong affection for their state.
Which means that, if one area is economically depressed at the same time that another area is booming, the problem tends to sort itself out as people move from the struggling area and to the prosperous one.
In Europe, that just doesn't happen to nearly the same extent.
No, but people in the South have an affinity for the South and people in coastal cities have an affinity for those, too.
This sounds like the opinion of a European who has never actually lived in the US. People are much more married to their states than it seems that you'd believe.
While someone from (say) Connecticut might not think much of moving to Maine, they would probably feel different about moving to Iowa, Washington, or Alabama.
Here's one of the various maps I've seen of US cultural regions: [0]
It seems to be accurate for the areas I know anything about; I can't speak for it in other places.
[0] https://preview.redd.it/ntsqzyp8uq531.png?auto=webp&s=afb643...
A lot of these states have backdoor ways of keeping out culturally incompatible folks from moving state to state by making mere victimless possession of certain items disproportionately linked to certain American cultures into felonies.
Did you miss the article last week on HN where 60% of American adults live within 10 miles of where they grew up? People in the US absolutely have a strong affinity for their states. Just as in the EU, they may choose to leave for better opportunities however.
This is not new in the 17th century Dutch VOC ships were crewed by destitute Swedes and Germans. Mobility in Europe is high which is why you can get excellent baklava and spaghetti as far as Helsinki. This is why the European Union makes sense.
https://worldpopulationreview.com/us-cities/portland-or-popu...
If you look at where people migrate from,
https://depts.washington.edu/moving1/Oregon.shtml
California and Washington are the major sources (of course!) but (1) California is not PNW, and (2) places other than CA/WA contribute many more migrants.