[tomp]

Not sure about whites and blacks in the US, but as far as genetics are concerned, (black) Africans have far more genetic diversity than (white) Europeans.

[carapace]

Africans enslaved in America effectively had their original cultures denied and destroyed. That's why it's appropriate to capitalize Black but not white when referring to American subcultures. (Whiteness isn't genetic. E.g. in South Africa under apartheid Chinese people were legally black but Japanese people were legally white.)

[_-david-_]

Various whites had their cultures denied and destroyed as well. By your logic White should capitalized as well.

[carapace]

Which "various whites" specifically?

[_-david-_]

Slavs where taken as slaves and is where the word slave derives from.

[carapace]

We capitalize "Slavs".

(FWIW, Slavic culture didn't originate with the enslaved Slavs.)

[_-david-_]

Then we should also capitalize White as well as Black.