My grandfather's nationality?

Question

He has passed. And his name is Alfred Charles Meckling; and lived in Pennsylvania all his life.

Answer 1

Do a search on the web, everyone has a cousin that they haven't seen in years who has done some of the research already. in a search engine type in

(your last name)+genealogy

you can also try

(your last name)+family

Good Luck

Answer 2

American.

Answer 3

If he lived in the US his entire life, he was clearly BORN here (unless he moved from Canada when he was 3 weeks old).. he is American nationality.

If you meant his ancestry (where his ancestors came from).. you identify who they were, and where they came from.  And no.. ancestry is not about what the last name is/was.