Even between states. What many people define as "black" culture and language in the US has its roots in southern culture, regardless of race. Cultural and linguistics strategies between people from Washington and Mississippi are pretty stark, regardless of race.

I even remember the main character in Ralph Ellison's "King of the Bingo Game" complain about how "cold and unfriendly" he found other black people from the North compared to where he was from in the South.