Race in American is about how you look not really about your blood.
Nobody ever says that a blond baby, that baby is a brunette because its parents have brown hair.....

Not to mention 85% of African Americans have European DNA and
33% of White Americans have African DNA.

Johnny Depp is White but he has Black and Native blood.

Nickie Manaji is Black because in america a dougla (half indian & half Black) looks mainly black.
@Elle
yes and no, Nelson Mandela can easily pass for mixed yet he is not.
The thing is with black people you can be really dark or really light and have all features in between and be 100% African.