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P3D Keystone State


BTW, Pennsylvania is known as the Keystone State because it resembles a
Keystone..

Well, not really. It's a rectangle, with perpendicular sides. During the
Revolution it was a key state in the fight for independence, both in terms
of its population size, and it's position in the middle of the colonies, as
important as a "keystone" in a Roman arch.  


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