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Climate and the "green revolution" in the 20th century:

  • Highland climate in central Mexico allows for better soils and less vulnerability to tropical diseases (which before the 20th century, ravaged entire villages on the coastal areas).
  • The green revolution in the 20th century allowed for increased yields of wheat, rice and maize crops.

Both factors explain the population explosion in Mexico, which increased from 12-14 million from 1521 to 1921 to 25 million in 1950 to 56 million in 1975 to 112 million in 2010.

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