I honestly can't tell if this is being sarcastic or not.
In the off chance this isn't sarcasm, then...LOL!!!
The U.S. being down and out?? Not even close. If this gets as bad as it could, the U.S. has 1000x more capabilities to handle it better than the countries you listed. You honestly think they would go to war with a superpower when they'd be struggling hard at home? None of those countries have the cajones to do that....