It doesn't actually exist. The historically prosperous (and very German, for whatever that's worth) manufacturing towns between Philly and Harrisburg don't have a lot in common with the much more genuinely rural far north of the state. And so on and so forth.
No, but the people who took the coal and made it into things like iron and steel were located in central and eastern Pennsylvania.
!?!?!
Rather famously, the main centre of the steel industry in Pennsylvania was Pittsburgh.
I think people are thinking of Bethlehem Steel, whose failure happens to be particularly famous.
That is exactly what I was thinking of. I've been to Bethlehem before and it's such a sad place...