NAFTA and the European Union are probably not comparible, two different things.
We do live in a global world and a global economy, you are correct. That global world is largely dictated by the US though, being the strength and presence of our military, English (although British English elswere spoken) being the predominant means of communication, American music dominating everywhere, American movies dominating everywhere, tyhe US$ being the dominant currency. We have folks who have changed everyones life globally here, from an imported Einstein, to Steve Jobs, to Bill Gates and more. So the comparison with the UK is not apples to apples.
We are a unique country with a young culture in a very good place, unfortunately a lot of damage to that in the past two years, as far as relations outside of our borders.
Old school here, so I try and protect (insignificant I know) what we have by not spending my Dollars with someone like Horror Freight. ( Harbor Freight)
In short, the global economy is really US dominated, but with a lot of threat to change in the longer term.