Section 1
What Was the Columbian Exchange?
Key Idea
After 1492, people from the Eastern and Western Hemispheres began to trade new items. This great transfer of plants, animals, and ideas is called the Columbian Exchange. Europeans brought horses and wheat to the Americas. They took back corn and potatoes to Europe, Africa, and Asia.
The exchange also had terrible results. Europeans unknowingly carried diseases, like smallpox, that were deadly to Native Americans. These sicknesses killed millions of people who had no immunity to them.