A lot of the extraterritorial power of US jurisdiction is due to the fact that a lot of international commerce is denominated in USD. Matt Levine writes about this occasionally in his informative and amusing news letter "Money Matters" [1], for example [2]:
> The basic system of international trade is:
> 1. International trade is done using U.S. dollars.
> 2. Any trade done using U.S. dollars is subject to the jurisdiction of the U.S. government: Dollars flow through banks in the U.S., and if the U.S. government doesn’t want dollars to be used for some purpose—to fund genocide or terrorists or dictators or narcotraffickers—then it can reasonably effectively cut off dollar funding for those purposes, and punish banks, including foreign banks, that disobey it.
> 3. The U.S. is a good and responsible steward, and only cuts off dollar funding for bad purposes like genocide or terrorism or totalitarianism or drugs.
[...]
> If other countries lose confidence that the U.S.’s decisions about who can use dollars are predictable, stable, constrained by the rule of law and responsive to the concerns of other large economies, then those other countries might look elsewhere.
Or the beginning of [3]:
> There was also a sense of uneasiness with the U.S. using the power of the dollar to enforce its foreign policy: Because all dollar payments are nominally processed through the U.S., moving dollars anywhere in the world effectively puts you under U.S. jurisdiction, even if the dollars are financing purely non-U.S. transactions. Lots of Europeans — bankers but also politicians and businesspeople and regular citizens — didn’t have the same antipathy to, say, Cuba that the U.S. does; they found it unfair that European banks were prohibited from doing business in Cuba not by European regulations but by American ones.
[1] https://www.bloomberg.com/opinion/authors/ARbTQlRLRjE/matthe...
[2] Section "Dollar hegemony" of https://www.bloomberg.com/opinion/articles/2018-12-04/trying...
[3] https://www.bloomberg.com/opinion/articles/2018-11-20/u-s-sa...