Did USA make a unforced error 1898-2016 by making itself the "world's policeman" at great cost to itself? Potential? Alternatives? Was it worth it?

Europe & Japan got the shiny new Marshall Plan while USA industry eventually stagnated cuz our industrial "stock" was antiquated & inefficient?

Europe & Japan got NATO & ASEAN while we subsidized their defense?

What happens if the triad of economic, military & cultural power that USA has relied on falters & fails?

Did USA make a unforced error 1898-2016 by making itself the "world's policeman" at great cost to itself? Potential? Alternatives? Was it worth it?
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