>>4692277"Scientists say as many as 15 million people – an estimated 80 per cent of population – were killed when an epidemic known as cocoliztli swept Mexico’s Aztec nation in 1545."
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https://www.google.com/amp/s/www.thesun.co.uk/news/5351735/aztecs-were-wiped-out-by-horror-eye-bleeding-disease-that-killed-15million-in-just-five-years-scientists-reveal/amp/)
"Epidemics soon became a common consequence of contact. In April 1520, Spanish forces landed in what is now Veracruz, Mexico, unwittingly bringing along an African slave infected with smallpox. Two months later, Spanish troops entered the capital of the Aztec Empire, Tenochtitlán (shown above), and by mid-October the virus was sweeping through the city (depicted above in images from the Florentine codex, a document written by a 16th century Spanish friar), killing nearly half of the population, which scholars today estimate at 50,000 to 300,000 people. The dead included the Aztec ruler, Cuitláhuac, and many of his senior advisers. By the time Hernán Cortés and his troops began their final assault on Tenochtitlán, bodies lay scattered over the city, allowing the small Spanish force to overwhelm the shocked defenders."
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http://www.sciencemag.org/news/2015/06/how-europeans-brought-sickness-new-world)
http://blogs.plos.org/publichealth/2013/07/30/g"A hundred years later, after a series of epidemics decimated the local population, perhaps as few as 1.2 million natives survived. Records confirm there was a smallpox epidemic in 1519 and 1520, immediately after the Europeans arrived, killing between 5 and 8 million people. But it was two cataclysmic epidemics that occurred in 1545 and 1576, 25 and 55 years after the Spanish conquest, which swept through the Mexican highlands and claimed as many as 17 million lives."
uest-post-what-killed-the-aztecs/)