Inspired by @bob_’s answer to a recent question, in which he supplied this link.

What if the USA vowed not to reimburse any other countries for the Treasury Security bills/notes/etc. that they hold? Do you think other countries would physically attack the United States? Would they boycott American companies? What do you think?

I apologize for not having enough time to add more to the question’s details. I just wanted to get this question out there.