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Don't know whether to put this in pre-1900 or ASB, but since this involves a somewhat plausible change in prehistory, I'll put it here.

What if the Appalachian Mountains were about as high and rugged as the Rocky Mountains? There could be a couple of explanations for this: less erosion, volcanic activity, etc. Basically, how would a much rougher Appalachian range affect the colonization of North America? Would the presence of an nigh-impassable barrier make the St. Lawrence Seaway more important as the gateway to the Midwest? Would the East Coast become a backwater? And if there's volcanic activity, how would that affect development?
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