Foreign critics have long chafed at the “exorbitant privilege” of the U.S. dollar as global reserve currency. The U.S. can issue this currency backed by nothing but the “full faith and credit of the United States.” Foreign governments, needing dollars, not only accept them in trade but buy U.S. securities with them, effectively funding the U.S. government and its foreign wars. But no government has been powerful enough to break that arrangement – until now. How did that happen and what will it mean for the U.S. and global economies?…