Landform Regions of Pennsylvania
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Map of the Landform Regions of Pennsylvania.

Credit: The Atlas of Pennsylvania, Temple Univ. Press, 1989, page 18.

The "endless" succession of mountain ranges that run diagonally across Pennsylvania divided Philadelphia and eastern population centers from its western counties. To link the two regions together, the state government and private entrepreneurs would spend decades constructing expensive roads, canals, and then railroads.

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