Old World & New World · Article 8 of 22 · 1500–1750
Potatoes, pathogens and horses changed entire societies
People & builders: Indigenous American farmers over millennia; Spanish, Portuguese and African farmers and merchants; eighteenth-century European agronomists
Food crossed oceans in both directions
Maize, potatoes, cassava, tomatoes and cacao had been cultivated by American peoples long before Europeans arrived. Introduced into parts of Africa, Asia and Europe after contact, these crops eventually altered what households could grow and eat. Cassava provided a hardy food source in parts of tropical Africa; the potato took time to become widely adopted in northern European agriculture. Maize became important in several European and African regions but required local adaptation and knowledge.
The traffic was not one-way. Wheat, sugarcane, cattle, pigs and horses crossed to the Americas. Horses changed transport and warfare among many Indigenous peoples, though access and meaning varied widely. Livestock and plantation agriculture changed fields, forests and rights to land; useful animals could also destroy crops or displace earlier ecological relationships.
Disease made unequal encounters still more destructive
Smallpox and other pathogens carried from the Old World caused catastrophic mortality in populations without prior exposure to them. Particular epidemics can be difficult to reconstruct precisely because colonial records are incomplete or biased. The impact was magnified where conquest imposed hunger, forced labor, war and displacement. Disease cannot serve as a substitute for an account of those human decisions.
Transatlantic exchange also moved unfamiliar infectious diseases in complex ways, along with parasites and insects. The health consequences were not confined to the sixteenth century. International travel, military movement and trade repeatedly carried pathogens across frontiers, encouraging later institutions of quarantine, port inspection and public health.
A modern kitchen carries the evidence
A dish made with Italian tomato sauce, Indian chilies, Irish potatoes or West African cassava shows how widely American crops spread. These ingredients are now traditional in places where they were previously unknown. The same transfer produced ecological problems when invasive organisms or extensive monoculture displaced other species.
The achievement was increased agricultural possibility for many people. The losses included Indigenous land, biological diversity and, in conquered regions, lives on a terrible scale. Food traditions today are evidence of both exchange and coercion, and neither part of the record should be hidden.
Dates & turning points
- 1492–1500: The first sustained Atlantic encounters open new routes for crops, people and disease.
- 1500s: American maize and cassava spread unevenly across parts of Africa and Eurasia.
- 1500s–1700s: Horses, livestock and sugarcane transform environments and work in the Americas.
- 1700s: Potato cultivation becomes increasingly important in northern European food systems.