How are the effects of the Columbian exchange still at work in our modern society?

Two of the biggest areas in which modern society is still feeling the effects of the Columbian Exchange today are food and diseases. The trade industry exploded after Columbus reached the New World. Europe had crops and other items that the New World lacked, like rice, apples, bananas, and even horses, which revolutionized transportation for Native Americans and prompted many tribes to adopt a more nomadic lifestyle, particularly those who lived in the mountains.
The New World, meanwhile, had potatoes, tomatoes, maize, tobacco, and other crops that Columbus and his fellow travelers had never before encountered. They also sent domesticated animals like llamas and alpacas back across the Atlantic. In short, Columbus's trip proved that a trade route was possible, and once both sides realized they had goods the other didn't, the overseas trade of non-native products boomed. We consume many of the results of this trading today.
But there were stowaways. As transatlantic trade flourished, so did diseases, as Europeans brought unfamiliar germs across the ocean with their cargos full of rice and bananas. Communicable diseases like small pox, yellow fever, and measles throttled the Native American people, causing the death of 80 to 95 percent of the population. Invasive plant and animal species like tumbleweeds, wild oats, gray squirrels, and feral cats were ferried across the Atlantic as well.
http://public.gettysburg.edu/~tshannon/hist106web/site19/

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