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Disease and catastrophe
Of all the kinds of life exchanged when the Old and New Worlds met, lowly germs had the greatest impact. Europeans and later Africans brought smallpox and a host of other diseases with them to America, where those diseases killed as much as 90 percent of the native population of two continents. Europeans came away lucky -- with only a few tropical diseases from Africa and, probably, syphilis from the New World. In America, disease destoyed civilizations. By David Walbert.
