I wasn't speaking about skin tone, but also physical features indicative of African descent. At any rate, in the United States (which is the context of the holiday), class, nationality, and ethnicity don't contribute to perceptions of race; it's effectively the presence or absence of indigenous African physical traits, skin-tone being but one example. Perhaps class, nationality, and ethnicity could be used in 'tie-breaker' cases where race isn't visibly apparent, but that's the extent.