Twenty-five years later, a mysterious viral hemorrhagic fever killed fifteen million—roughly eighty percent of their population at the time. Imagine that: a mysterious illness killing eight out of every ten people. In America, that would be over 240 million people. It’s unthinkable, but it happened, right here in North America, less than five hundred years ago. We still haven’t identified the pathogen that decimated Mexico in the sixteenth century, but we do know it returned twenty years later, in 1576, following two years of drought. It killed another two million from the already decimated
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