Well I purposely wrote it in a hand-wavy immature way because I don't really understand it. But I did say "if we ever needed to." So whatever the equivalent of declaring bankruptcy is for a country.

Though I would like to amend my nonsense from "a citizen" to "actually in the country" I am imagining cutting off foreign governments and oligarchs, not humans that are actually living here.

Basically, if there was a bad war or something, and we needed to cut ties with most of the world. It's better to be left with the goods than the cash. Because cash has no intrinsic value.