I just watched a fantastic show about the Americas before Columbus. It really is amazing what has happened in the past 500 years since Europeans (supposedly) first came ashore in America.
The Columbian Exchange is defined as:
the widespread exchange of animals, plants, culture, human populations, communicable diseases, technology and ideas between the American and Afro-Eurasian hemispheres following the voyage to the Americas by Christopher Columbus in 1492, colonization and trade by Europeans in the Americas, and institution of the slave trade in Africa and the Americas.
Before the Columbian Exchange, there were no oranges in Florida, no bananas in Ecuador, no paprika in Hungary, no potatoes in Ireland, no coffee in Colombia, no pineapples in Hawaii, no rubber trees in Africa, no chili peppers in Thailand, and no chocolate in Switzerland.
Also take a look at the animals we take for granted in America. Before Columbus there were no horses, pigs, cows, donkeys, rats, sheep etc....
Take a look at this wiki link:
http://en.wikipedia.org/wiki/Columbian_Exchange It really is fascinating to learn that most of the stuff we consider common, might not have been natural to where we live.