Answer:
The Columbian exchange was caused by the arrival of Europeans in the Americas. The first of these European was Columbus, who arrived in what is now the Bahamas in 1492, hence the name of this historical event.
The Columbian exchange created completely new trade routes between the Americas and Europe, and both continents obtained goods that were unknown to each until then. Europe obtained from the Americas goods such as the potato, the tomato, chocolate, and tobacco, while the Americas obtained goods such as wheat, livestock animals, and horses.
This event changed completely the history of the two continents.
