---
node: na_columbian_exchange
type: event
slug: columbian_exchange
title: "Columbian Exchange"
lead: "The Columbian Exchange was the vast transfer of plants, animals, people, and diseases between the Americas and the rest of the world after 1492. It reshaped diets, economies, and populations on every inhabited continent."
published: 2026-07-13
updated: 2026-07-13
---

## What happened

Beginning with Columbus's voyages, crops, livestock, people, and pathogens crossed the Atlantic in both directions. The exchange linked hemispheres that had been biologically separate for thousands of years.

## Background

The Americas sent maize, potatoes, tomatoes, cacao, and tobacco outward, while the Old World brought wheat, sugar, horses, cattle, and pigs. It also drove the forced movement of millions of enslaved Africans to the Americas.

## Consequences

American crops fueled population growth across Europe, Africa, and Asia, and horses and cattle transformed American life. Its darkest side was the epidemics — smallpox above all — that killed a large share of Indigenous Americans.