IMHO Skin color isn't the only designation.
And who is more African American that someone like Teresa Heinz Kerry, who was born in Mozambique and is a naturalized citizen?
Yeah, it's a stupid term.
An anecdote: Egyptian friend studies abroad in the US, gets arrested visiting New York state for very overdue parking tickets he was unaware of (studying elsewhere in the US). They bring him to the station, and the cops attempt to fill in the paperwork, and they admit to my friend they are not sure what to fill in. In the end, they look in their procedure book, and said he is Arab and that is considered a subset of Caucasian in their definition. I was actually surprised by this.
http://usatoday30.usatoday.com/news/education/story/2011-12-...
Race is something that affects people's lives in the real world, beyond boxes on applications. This argument is becoming a little academic.
Of course, a substantial number of white Americans would be surprised by discovering they had ancestors from Africa in the recent past. (Most African-Americans, on the other hand, wouldn't be too surprised to find out many of them have European ancestry.)
For sure! But I suspect the most meaningful coarse clusters might end up being some large number of divisions of sub-saharan africa and then everyone else. Definitely not the "White", "Black", "Asian" categories people in the states take for granted. And even ignoring the amazing diversity of Africa (compared with the rest of the world), did the Irish become more genetically white when they became culturally accepted as white? Did Latin Americans of European descent become less genetically white when people further North stopped viewing them that way? Why do some races trump others (i.e., why is Barack Obama considered black)? The boundaries of these categories seem very arbitrary and not derived by any rigorous means at all.
The outcome would no doubt have a lot in common with the ugly and ill-fitting suit made for Gulliver by the tailors of Laputa, who used quadrants, rules, and compasses rather than a simple tape measure.