The US is one of the world's least import/export-dependent economies.
Furthermore, you can see a list of our top 10 import/export partners here; only one is European: https://oec.world/en/profile/country/usa
The US became the world's largest economy around 1890, half a century prior to the start of NATO: https://ourworldindata.org/grapher/gdp-maddison-project-data...
Of the 20 most valuable companies in the world, 16 are American: https://companiesmarketcap.com/
(Of course, military strength rests on a basis of economic strength. That's international relations 101.)
This is why I say that Europeans are delusional. They're uninformed about the most basic facts about the world. The claim that the US economy is "mostly" based on integration with Europe is just astonishing. Your colonial empires are long gone, but your colonial mentality is remarkably unchanged. No wonder you think of yourself as a "belle" with this level of delusional self-regard.
It's not just your economy that depends on us. It's every single measure of power. Rammstein. Sigonella. SWIFT.
Every single dimension of American power is based on governments in Europe granting it. I would suggest you stop being so ungrateful before we stop doing so.
We are the Belle of the Ball, the only superpower that has both China and the US dependent on them. Whoever we choose to support is who wins global dominance. And right now, the US is being a bit of a shitty boyfriend.