This is not true.
Pennsylvania is an eastern state. Part is east coast. Part is interior east. A strong argument could be made that the central and western parts are actually "Appalachian" and I would not argue with that. I've lived on both sides of the state and they are far more like each other than anything to the west. In fact, if the center and west resemble anything, it is upstate New York. In terms of history, culture, architecture, politics, sporting traditions and leisure patterns Pennsylvania is tied to the east, not the midwest.
Apologies in advance for a somewhat off-topic post on a wrestling board but I can't let a comment like the one above go without responding.