The transformation of the US from an isolationist power, into one not only willing, but eager to get mixed up in European blood feuds has got to be the worst blow dealt to the Republic since its founding.
The thing is we really didn't have a choice. With the advent of nukes, rockets, economic warfare, etc. And rapid rise of communism it was clear in the 1940s that we couldn't continue to depend on the strategy of "use our oceans and armed population to fend off invaders" and remain isolationist.
The USSR had made it pretty clear that they considered our entire way of life to be evil and in need of "cleansing". If we let them sit back and rake in all of europe and asia, they would eventually make more nukes than us and it was only a matter of time. The bretton woods agreement was about national scurity, not economic security. That's part of why our economy isn't all that dependent on the international system outside cheap labor (compared to the rest of the world).
The time to pull back was, as trump has always said, in the 1990s when the USSR fell. The current system had served its purpose, and it wasn't as if we had to completely abandon alliances or trade partners, or
necissarily even give up being the world police and keeping maritime law enforced. It's just that the time had come for us to
get something tangible out of it. Our incentive to do it before was containing communism, once that threat was gone, we lost any incentive and our doing it became
charity and charity on that scale just doesn't last.