From the 16th to the 18th centuries, the Spanish Empire used a system of convoys, called treasure fleets, to transport a wide variety of items to Spain from its territories in the New World. Seven days after departing from Havana, Cuba, all 11 of the ships in the 1715 treasure fleet sank during a hurricane near present-day Florida, resulting in the deaths of thousands of sailors. The disaster also resulted in the loss of what precious items, some of which still occasionally wash ashore? Discuss