Canada

So, when I say this, I mean something more than simple citizen led movements. Those will curtail some trade, for sure, and I'm all for them.

In this case, I'm referring to the types of things that we plebs have no control over. There are a fair number of banking rules, for example, that are mandated by the US government in order to do business with US taxpayers. Some number of years back, for example, a bunch of banks globally just stopped allowing US taxpayers to have accounts, because of US laws that didn't allow time for the banks to make the changes required, and imposed high fines if US taxpayers held accounts that weren't reported to the US. (I'm pretty sure that US taxpayers are allowed bank accounts throughout the world again these days.)

Should the US try this kind of thing on a larger scale, I think that will either lead the banks towards debanking many individuals throughout the world as the US imposes sanctions on more regular citizens of other countries, a two-tiered system where the banks attempt to comply, or larger scale choices to not cooperate with the US on a financial level, which would affect every country that own American debt.