> And yet the Navajo Nation bordering both of them has fairly strict gun registries.

The fact there are political differences by region is not a defining factor, or the regions would look very different. The fact it is a cultural topic at all, looks to be one common factor. I feel like I'm talking in circles now.

Regardless, I really don't understand this sort of hair splitting. My imagination isn't that expansive, yet I can understand how these regions might have been determined in many cases. Asking the authors might get answers to these kinds of questions.