This whole thread is people making mountains out of molehills. People can "choose" their "race" in Delaware because that's what people do everywhere else too. Every time you have to fill in your ethnicity in a form or anything like that, you're basically "choosing".
And know why that exists? Because this is not as simple as some people think.
A great example would be Mariah Carey. Many people say she's black. She has black, white, Hispanic and native american descent. But I grew up in Brazil, and if I had to "choose a race" for her, I'd undoubtedly say she's white.
You can't force someone to fill in a form based on someone else's perspective, so the only plausible way to do it is to let each person fill in according to his or her own perception. Yes, if you get individual cases it might seem crazy (for example, it would be non-sensical for Justin Bieber to say that he's black), but when do you draw the line? It would be unethical to have a skin tone chart à la Family Guy saying "this skin tone is too black for the person to identify as white" or something like that.
By the way, it's scary how people from many countries, including the United States, separate white and black people so emphatically and clearly. Having grown up in Brazil, a country studied for its ethnic and cultural diversity and miscegenation, it's weird to think of such things as "black neighborhoods" or "white culture". Yes, racism is a thing in Brazil, but it's much less trivialized.
