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Up until very recently it was believed that in 1491, the year before Columbus landed, the Americas, one-third of the earth's surface, were a near-pristine wilderness inhabited by small roaming bands of indigenous people. But recently unexpected discoveries…

Two hundred million years ago the earth consisted of a single vast continent, Pangea, surrounded by a great planetary sea. Continental drift tore apart Pangaea, and for millennia the hemispheres were separate, evolving almost entirely different suites…