Your point is a little misleading I think. How big is the list of "most developed nations" after you remove the US and Euro Zone from the list?

Yes, every country CAN issue national debt. But issuing sovereign debt is more common largely because investors prefer it.

Either way, I didn't mean to sound misleading by calling it "rather unique." Thanks for helping me clarify.

Japan, South Korea, Taiwan, Singapore, England, Russia, Canada, Australia, Switzerland, Iceland, Israel, Sweden, Norway, Denmark, New Zealand, and arguably PRC, Brazil, Argentina, Turkey, India, Mexico, Indonesia, Qatar, and Chile, are all developed nations not in the US or Eurozone.

You are, however, correct that most of these countries issue their debt in US dollars ("sovereign debt") rather than their national currencies.