Take it back further than that to at least the American Civil war.
Particularly this right here:
Ultimately, a country is not simply its geographical borders with the people inside of it. It is something more - and deeper. A nation must share a common heritage, language, culture, faith and myths. Once upon a time, Americans celebrated the same heroes, sang the same patriotic songs, read the same history and literature, and gloried in its exceptional nature: a city upon a hill, with liberty and freedom for all. It was understood that, for all of our different ethnic and religious backgrounds, America is a product of English and Christian civilization. Those days are long gone.
Agree.