Drinking in northern Europe does have a way longer and more entrenched history than elsewhere though. Colonial men women and children all drank watered down rum and beer which were more hygienic than water. In China, by contrast, half of the population gets Asian flush and cannot tolerate alcohol, and there is a strong traditional culture of boiling water and drinking tea!
You could tell the story as like, alcohol puts pressure on a population to evolve better responses, and with enough time the flush evolves and that helps limit drinking. But that's pretty just-so.
Arguably what has changed is the ABV of such beverages. Post-industrial alcohol percentages are way higher than what precolonial mesoamericans, ancient Greeks, and vikings we're drinking
OK, but Pine Ridge is in North America. There could have been enough isolation in pre-Columbian times for north American indigenous to evolve a different alcohol response from mesoamericans.
Like I said: I am not an expert, and I have no idea whether this hypothesis is true or not. I'm just not aware of any facts that would rule it out.
The "alcohol flush" reaction seems to be genetically conserved in Asia because it gives resistance to rice pathogens not because it protects against "alcoholism".
Having kids at 30 is historically very late. Late teens and early 20s was much more common. So perhaps not a few dozen, but certainly over a dozen.