[krapp]

>Why does “Black culture” in the US differ from “White culture”?

One factor - white Americans have historically identified not as "white" primarily, but by country of origin - Italian, German, British, etc. "White" as a culture tends to be used as a reference in contrast with and in comparison to "black" culture or people.

Whereas African slaves and their descendants were deprived of the opportunity to identify with their culture and countries of origin, so they had to build a cultural identity around the only common attribute and heritage they were afforded - their race.