The Europeans brought with them many diseases to America, which devastated local populations, but the Native Indians also gave the Europeans the disease of Syphilis, to which the Europeans and the people of the Old World had no immunity. It remained untreatable until antibiotics, at least so far as I know.
What if, by a stroke of evolutionary luck or whatever would be needed, the people of the Old World were immune from Syphilis?
What if, by a stroke of evolutionary luck or whatever would be needed, the people of the Old World were immune from Syphilis?