This is an interesting way of seeing it. I understand the overall point you are making, but those terms have a different meaning to me. As an American decendant of slaves, one of the reasons I prefer Black for my identity is because that process of slavery was specifically designed to break our relationship to homeland or culture. Outside of genealogy tests, there is no way to know what part of Africa we came from, what language, tribe, traditions, and heritage came before slavery. Our names were inherited from owners. There is no continuous, unbroken chain of knowledge and culture that an African immigrant (or descendant of immigrants) experience. We have made our own culture based on this in-between-ness. Black, to me, is not so much about being American, but being a decendant of slavery; losing and inheriting everything that comes with that. Belonging everywhere and nowhere. That you know you are Nigerian gives you a very different relationship with Africa that earns the hyphenated term no matter how well you mix with American Black culture.