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Regional History

THE AMERICAS

For 15,000 years, two massive continents developed in total isolation from the rest of humanity. When the oceanic wall was finally breached in 1492, the resulting collision created the modern world.

Human Habitation
~15,000 Yrs
Indigenous Pop. (1492)
~60 Million
Concept Zero: Biological Collision
The Columbian Exchange (1492)

The Americas
Exports to Afro-Eurasia

  • Potatoes
  • Maize (Corn)
  • Tomatoes
  • Cacao (Chocolate)
  • Tobacco
  • Vanilla

Afro-Eurasia
Exports to The Americas

  • Wheat
  • Sugar Cane
  • Coffee
  • Rice
  • Apples
  • Citrus

The global diet was rewritten. The caloric density of New World potatoes fueled a massive population boom in Europe, while Old World sugar cane became the devastating cash crop of the Americas.

Archaeological Decoder: Radiocarbon Dating

How do we know humans arrived in the Americas 15,000 years ago? We measure the radioactive decay of Carbon-14 found in ancient campfires and bones.

While alive, an organism absorbs Carbon-14. When it dies, absorption stops, and the Carbon-14 slowly decays into Nitrogen-14. By measuring the ratio of C-14 remaining, we can pinpoint its exact age.

The Decay Equation
N(t)=N0eλtN(t) = N_0 e^{-\lambda t}
  • N(t)N(t) = Remaining Carbon-14
  • N0N_0 = Initial Carbon-14 (at time of death)
  • λ\lambda = Decay Constant (Half-life is ~5,730 yrs)