Conversation so far:
In what ways did David McCullough experience growth?
Trying not to become Bad News McCullough, David McCullough decided to write about a subject showing people were not always foolish and inept or irresponsible.“
Where did David McCullough grow up as a youth?
David McCullough was born and raised in Pittsburgh.
How long did David McCullough live in Pittsburgh?
David McCullough lived in Pittsburgh until 1951 when he began attending Yale University.

Question: Where did his parents come from?
Self-contained rewrite: Where did David McCullough's parents come from?