i’m not defining it out of existence, you’re the one defining it into existence, i don’t think there is such thing as an ethnic Pennsylvanian.
I’m not even sure the state has been around long enough that you could even start to approach that term. This is why it’s a demonym.
Ethnicity is generally related to long running family heritage. Which also means that it’s generally some form of mixed, Caucasian being the most generous group category of all of them, ironically.
Speaking of ethnicity, the origin behind the term Caucasian, is literally that humanity started in the Caucasus mountains. Which is definitely bullshit, now technically Caucasian is referring to race, but it’s used to refer to ethnicity these days, since race is kind of, bullshit anyway.
i mean your family might originate from what is now Pennsylvania, but that doesn’t make them Pennsylvanian, that would make them natives of a specific descent, most of which is likely gone from your modern lineage, unless you kept it all within the group somehow. American expansion was one hell of a history lesson.