this is just s semi-educated guess: anyone who holds bonds gets stiffed, yields on bonds go through the roof making it impossible to borrow any more money leading all government services to get cut down to the bone. Then its just tons of unemployment and people losing their homes, everyone worries for the future and, as if that wasn't enough, USA invades you to steal whatever natural resources you might still have under the guise of "bringing stability" or "spreading freedom" or something silly like that.