The Stand, it's multi-intra-cultural.
Yeah it takes place in America, you remember, the worlds most successfully diverse melting pot, a pot mixed with all that hodge podge of our past and present cultural influences handed down and passed around.
And another thing, yep this is one nation, but it's differences, in reality, can often be felt right down to the bone by simply crossing a county line, hell, crossing a street, maybe one side is Polish, and the other Italian, in their perspective influences going back generations.
The Stand, from small town Texas to Maine, different cultured, New Yorkers and a wise ol' God fearin' black woman living in a corn field, different cultures, you betcha...,point is, the characters in this story mostly come from vastly different cultures within a culture, it's what makes them and their relationships so interesting, what gives them depth...remember also, Larry Underwoods character started out as practically a case study of intra multi culture, L.A. vs. New York is famously used and satired in every form media and entertainment as massively culturally different.
My thoughts anyway.