In the final analysis, the institutional problems experienced by the EU during the Great Recession had their roots in one fact: citizens of the EU see themselves as Germans, or Greeks, or whatever, before they see themselves as Europeans. As a result, the Germans didn’t (and don’t) want to spend their money bailing out the Greeks, or the Italians, or anyone else.
I don’t remember ever hearing stories about people from, say, Massachusetts denying any moral obligation to provide funds for hurricane relief to Florida or Texas. While it appears that some of the worst features of the tax bill are being removed before final passage, however, you can still see evidence of efforts to weaponize the system against the residents of blue states. That kind of activity invites retaliation, and could ultimately result in the US looking more like the EU at its worst.