The Colombian Exchange was an economic explosion of sorts of international commerce (would later be called "globalization") after Columbus' discovery of the Americas. The exchange altered Europe's trade and imports. From the New World, Europe imported gold, silver, corn, potatoes, pineapples, tomatoes, tobacco, beans, vanilla, chocolate, and indirectly, syphilis. Due to Europe's new influence, North America changed through the imports of Europe and Africa. From these two continents, North American natives gained wheat, sugar (seeds), rice, coffee, horses, cows, pigs, slave labor, and indirectly, smallpox, measles, bubonic plague, influenza, typhus, diphtheria, and scarlet fever. Africa was impacted by this exchange due to the increased demand to farm newly discovered crops between North America and Europe. Native Africans were stolen in the slave trade in gross amounts in order to be used for labor in the recently developed sugar cane fields in Hispaniola. In the exchange, South America, specifically Peru was reaped for gold and silver ore. The illnesses from the Old World ended up slaughtering up to as many as ninety percent of the Native Americans in the centuries after Columbus arrived.