You are conflating a lot of different things and putting words in my mouth.
No country is free of problems. But the US in particular has so many issues that are significantly more obvious than something like federalism. So it is very unclear to me why you would single that out as having anything to do with the current state of that country.
American problems are rooted in Calvinism and the idea that everyone is entitled to everything around them if they can only grab it. Not federalism.
Europe is of course famously immune to nationalism and exceptionalist rhetoric
(Not this is a bad idea but still, lmao at pretending it’s just Calvinism of all things that’s the danger in the home of colonialism and the Crusades)
You are conflating a lot of different things and putting words in my mouth.
No country is free of problems. But the US in particular has so many issues that are significantly more obvious than something like federalism. So it is very unclear to me why you would single that out as having anything to do with the current state of that country.