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Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
Columbian Exchange
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Columbian Exchange


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  • 1. The Columbian Exchange AP World History Dan McDowell
  • 2. What is the Columbian exchange?
    • Term was coined by Historian Al Crosby of the University of Texas
    • Contact between any two peoples geographically separated from one another results in an ‘exchange’ of physical elements
    • The three main elements are: animals, plants, and microbes
  • 3. Animals
    • Llama only domesticated animal in Latin America
    • Cattle, horses, pigs, sheep => Americas
    • Changed use of land
  • 4. Animals
    • Significant environmental impact
    • Animal fertilizer became important part of agricultural system
  • 5. Plants
    • Europeans brought cash crops to Americas, brought new crops back
    • Maize, potato, tomato, tobacco, beans, cacao, and cotton => Europe
    • Sugar, rice, wheat, coffee, bananas, and grapes => Americas
  • 6. Plants
    • New crops flourished in Americas
    • Many indigenous plants crowded out by new crops and weeds
    • Old world crops stronger - had a more competitive original environment
    • Economy shifts to large scale agricultural production, labor intensive
    • Europeans adopt crops from Americas
  • 7. Plants
  • 8. Old World Microbes
    • European disease was particularly virulent
    • Smallpox, measles, diphtheria, whooping cough, chicken pox, bubonic plague, scarlet fever and influenza were the most common microbial diseases exchanged
    • Nearly all of the European diseases were communicable by air and touch.
    • The pathway of these diseases was invisible to both Indians and Europeans
  • 9. European Belief
    • There was no germ theory at the time of contact.
    • Illness in Europe was considered to be the consequence of sin
    • Indians, who were largely “heathen” or non-Christian were regarded as sinners and therefore subject to illness as a punishment
  • 10. Disease Raced Ahead
    • In most cases, Indian peoples became sick even before they had direct contact with Europeans
    • Trade goods that traveled from tribe to tribe though middlemen were often the vector of disease
    • There is little or no evidence to think that Europeans intentionally infected trade items for trade with Indians to kill them
  • 11. Smallpox
    • Central Mexico - 25 million in 1519 to less than one million in 1605
    • Hispa ñ ola - One million in 1492 to 46,000 in 1512
    • North America - 90% of Native Americans gone within 100 years of Plymouth landing
  • 12. Smallpox in the Americas
  • 13. Smallpox
  • 14. Why were Europeans immune?
    • Has everything to do with their original environments
    • Most pathogens originate with animals or insects
    • Domesticated animals and plants were more numerous in Europe
    • Greater diversity meant more ecological protection
  • 15. Demographic Significance
    • Native American population decreases
    • Europeans need labor, import African slaves
    • Europeans move to Americas to oversee economic production
    • Mixing of all three populations occur in varying degrees