It's funny to watch people try and analyze what made the US the world's dominant global empire when in reality it was a series of complex and contingent factors that can't be replicated because they could have only occurred in their exact historical circumstances.
For example, other countries have tried to replicate American dairying culture, buying into the propaganda put out by the dairy industry that milk drinking is the secret to America's success. So China started up loads of American-style dairies to provide drinking milk for a population... without the gene for lactase persistence.
That's what the free market talk feels like to me. America is at the top and that can't be replicated. There's only room for one at the top. When it collapses, we'll see what circumstances lead to the next great empire. It might be collectivism!