
Seems the indigenous people got sick, supposed they'd been poisoned. Not a good intro to neighbors. Of course, neither group knew about lactose intolerance. But what I didn't realize until Gabe explained it is that the ability to digest cow's milk is a genetic mutation. Handy if you have cows around but otherwise, as in the Americas for example, not a survival aid.
I'd always thought of it in reverse. I mean, I thought most everyone had this ability to digest cow's milk. The human norm. And then there were a few subgroups who for some reason did not have that ability. They had a condition, a flaw . . .

Thanks Gabe! Not just for the interesting history piece but for telling it in a way that de-centered whiteness. And Sam, younger, is studying a period he calls "The Conquering of the Americas."
Can you guess they're home schooled? And they can cook like the dickens, too. With or without dairy products.
Here's a map, not a great one, but gives some idea of the cultural distribution.