The Europeans Built Resistance to Certain Bacterias

The europeans, since they had animal agriculture a lot earlier than the rest of the world, built up resistance to certain factories. So when they came to other parts of the globe, like the andes and some parts of what is now australia, just, like, 80% of the population died out because they couldn't resist these bacterias. And it's because of these, like, you know, whatever, centuries of exploiting animals, and then they just went on to exploit human rans with that ability.