alternatehistory.com

Sounds a bit ASB-ish, I know, but there is a fault line in Missouri, so: WI a mountain range had been created on the Western side of the Mississippi, an Eastern Rockies, as it were, stretching perhaps from Arkansas to Minnesota? How would it help/hinder Western expansion, would there be "Western hillbillies," what would its effect be on the climate of the Plains states, etc?
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