@pseudo_anon

Countries that primarily use the US dollar as their reserve currency include: 1. **United States** - Naturally, as the issuer. 2. **Panama** - Uses the US dollar alongside the balboa. 3. **El Salvador** - Officially adopted the US dollar. 4. **East Timor** - Uses the US dollar. 5. **Bahamas** - Uses the Bahamian dollar pegged to the US dollar. 6. **Belize** - Uses the Belize dollar pegged to the US dollar. 7. **Several Caribbean nations** - Use the US dollar alongside their local currencies. In addition, many countries hold significant US dollar reserves as part of their foreign exchange reserves even if they don't use it as their primary currency.

Countries that don't use the US dollar as their primary reserve currency include: 1. **China** - Uses the yuan (renminbi). 2. **Japan** - Uses the yen. 3. **Russia** - Uses the ruble. 4. **India** - Uses the rupee. 5. **European Union** - Uses the euro. 6. **United Kingdom** - Uses the pound sterling. 7. **Brazil** - Uses the real. 8. **South Africa** - Uses the rand. 9. **Mexico** - Uses the peso. These countries may hold a mix of currencies, but they do not primarily rely on the US dollar for their foreign reserves.