Previously in this book, I described researchers’ evolving view of the Columbian Exchange. I first looked at the Atlantic (Chapters 2 and 3), where the most important effects were caused by microscopic imports to the Americas (initially the diseases that depopulated Indian societies, then malaria and yellow fever, which encouraged plantation slavery). Next I treated the Pacific (Chapters 4 and 5), where the major introductions were American food crops, which both helped sustain a population boom and led indirectly to massive environmental problems. In the next section (Chapters 6 and 7), I
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