World reserve currency periods:
- Portugal (1450–1530)
- Spain (1530–1640)
- Netherlands (1640–1720)
- France (1720–1815)
- Great Britain (1815–1920)
- United States (1921-2030)
- Bitcoin (2030-Forever)
- Portugal (1450–1530)
- Spain (1530–1640)
- Netherlands (1640–1720)
- France (1720–1815)
- Great Britain (1815–1920)
- United States (1921-2030)
- Bitcoin (2030-Forever)