How 1492 Reunited Biological Worlds Separated by Millions of Years
In short: The Columbian Exchange was not just a trade route; it was a massive biological globalization. This video explores how transoceanic voyaging merged isolated ecological provinces, fundamentally reshaping the history of the Americas, Europe, and Africa.
Coined by Alfred W. Crosby in 1972, the Columbian Exchange categorizes the movement of diseases, animals, and plants across the Atlantic. Because the Americas had been isolated from Eurasia and Africa for millennia, Native Americans lacked immunity to 'Old World' diseases like smallpox, measles, and influenza—infections that had become endemic in Europe by the 15th century.
The consequences were devastating: by 1600, Native populations in the Caribbean plummeted by over 99 percent, with total American population losses reaching up to 95 percent by 1650. Conversely, the exchange introduced horses, cattle, and pigs to the Americas, where they reproduced prolifically on the Great Plains and the Pampas.
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Sources
- Summary by Intellect · source: The Columbian Exchange: Crash Course History of Science #16
- Also: Columbian Exchange | Diseases, Animals, & Plants | Britannica
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