you made it first. You said that ethnicity isn't genetics. Which is true, because ethnicity != genetics. In order for your statement to be properly true it would have to something more like ethnic heritage = genetics, because heritage is genetics.
yeah, anyway, while you are technically pennsylavnian, that's not ethnic, that's a demonym, ethnically you would be american/native american, and whatever flavors you have kicking around in your lineage going into the past.
Sometimes they're vaguely related, but they're still distinct concepts and not directly intertwined. It's analogous to the concept of state and country pride, you might be proud of your state, and also your country, in different though familiar respects.