alternatehistory.com

What if a disease is able to evolve in the Western Hemisphere, lets say it came over with people on the Bering Land Bridge some millions of years ago, that was incredibly deadly. Over time Native Americans are able to build a resistance to it but still remain carriers. When the Europeans finally arrive it results in a very different, more deadly Colombian Exchange. In under a decade the new disease sweeps Europe and kills, lets say, 70%ish of the European population (while their diseases decimate the Native population). How would that change world history?
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