The US arguably would’ve thrived regardless, we had 50% of the world GDP post-WWII. That percentage pie has only declined, as other nations developed. Nations with disparate economic systems, some being top-down centrally controlled communist states. In fact, said states are the only ones who threatened the US economically.

And, the US is not the most libertarian country, it’s not even close. The US is developed, so it’s automatically more centrally controlled than most nations. There are plenty of underdeveloped nations that are, effectively, much more libertarian. Because their governments don’t have the capital to enforce much of anything. Those nations are doing quite poorly, hence why they are underdeveloped.

You will notice a pattern in the development of nations: as nations develop, the government has more stake in the macro economics of said nation. Because of course they do: they want the economics to go well, and they have the economics to enforce that, or try to. The US government does not “sit out” when things are going poorly, the opposite is true.