Speech latitude
Via ZH, this map of states that have passed useless "laws" attempting to stop campus censorship:
The latitude of latitude immediately stands out. It's the Mason-Dixon line.
Hits me right close to home, because this is pretty much the 'spread pattern' of my father's ancestors. Came to US around 1700, settled in Virginia. Expanded into Tennessee, then into Southern Missoura, then into Okla and Kansas. Since 1920 the spread has been a little broader, but many of the far-flung spreaders ultimately returned to home base in Okla.
As I will probably do next year. The restoring force is gaining as alien hyperlunatic insanity and mindless violence continue to fester in Spokane.
This set of genes never passed
through Arkansas on the way to Okla and Kansas, and never spread back into Ark later on. I don't know why Ark never attracted us, but the map matches the reality.
Why did they track the Mason-Dixon line? Because they were Southern by culture but not slaveholders. They couldn't stand Yankee shitheads, but didn't have much affinity with the slaveholding South either.
This 'dielectric zone' could explain the modern insistence on free speech as well. When you live on the line, you're accustomed to hearing and talking with both sides whether you like them or not.