It seems that introversion vs extraversion is an agreed up prime personality trait. Even in NPA theory, NP types are usually introverts as are NPA- types. But NPA+ are usually extraverts. So it's not related to P trait. But it may be that A trait marks extraversion?
As to geography, I can see the midwest (lots of plains) trends introverted. And the US West (around the Rockies) seems extraverted? So not sure.
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