If all hell breaks loose wouldn’t the US just say “screw you we aren’t paying” and utilize the largest military (by far) in the world to keep the goods flowing? Some version of that seems far more likely than UBI does. I’m not saying this would be good (it wouldn’t) and it would be a terrible threat to quality of life and make the US an absolute hellhole, but let’s be real here, if the bread and circuses stop the US citizenry is going to call for blood long before they even remotely consider UBI.