The Columbian Exchange: plants, animals, and disease crossing the Atlantic
After 1492, contact between the Americas and the rest of the world set off a massive exchange of plants, animals, and diseases now called the Columbian Exchange. Crops like potatoes and maize spread to Europe, Asia, and Africa, while horses and wheat spread to the Americas, but European diseases like smallpox also devastated Native American populations, who had no prior immunity to them.
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