> The thing that immediately jumps out at *me* is...

Actually, no. The *first* thing is... Wee, fractals! ;-)

> Anyway, why the east/west split? My random guess: Westerners arrived at
> the East cost, and moved towards the "wild west", colonising it as they
> went. Maybe that legacy still lives on.

On the other hand, I took a quick glance at Google maps, and it appears 
that virtually the entire Western half of North America is some sort of 
mountain range, so...

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