5 Dollars - Charles III Aztec Empire

The Aztec Empire fell with startling speed — Tenochtitlan surrendered to Cortés in August 1521, roughly two years after first contact. What the Spanish found there, including the treasury of Moctezuma II, was systematically melted and reminted into Castilian coinage, erasing one of the most sophisticated pre-Columbian exchange systems. The irony of striking gold to commemorate that civilization is not subtle.

Cook Islands has issued KM#3502 under its longstanding arrangement with the New Zealand government, which retains authority over the islands' defense and foreign affairs while leaving numismatic programs to local discretion — a relationship that has made Cook Islands one of the most prolific small-nation coin issuers of the modern era.