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The destruction of ancient Mexico’s culture by Spanish invaders is an integral part of every Mexican’s understanding of the country’s history. The megadeaths of 1545 and 1576 were believed to have been caused by Old World diseases such as smallpox and measles. The culprit instead is a New World hemorrhagic fever virus that appears after a long drought followed by a very wet season.These conditions happened on those 2 dates. Tree rings that show the weather conditions as far back as you can get them show severe droughts at the time Mayan culture collapsed. This is in the Discover Magazine.
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