Conversation so far:
Where was George M. Cohan's birth day written?
A baptismal certificate indicated that he was born on July 3, but George M. Cohan and his family insisted that he was born Fourth of July!“
Where is George M. Cohan's birth certificate from?
A baptismal certificate was from St. Joseph's Roman Catholic Church.

Question: Where was he born?
Self-contained rewrite: Where was George M. Cohan born?