@T.E.D. I disagree. The Columbian Exchange always came up around Thanksgiving (at least in Utah, where I did high school). Also, fun fact: people outside the Americas spiced up their food with black pepper, mustard, radish, wasabi, and other such ingredients before Columbus came along. Still, I have a friend from India who was shocked to hear that all chilli peppers only entered his cuisine a few hundred years ago :)