I mean they clearly sound like African Americans but the way they speak is more 'midwestern' If you see what I mean.Kanye has too much strain and the nasal shift in his to be "Country". It's crazy on just on MBDTF how many times he changes his timbre on each song he raps in. Twista does sound somewhat "Country" on half the time I listen to him, but man his enunciation is fukking amazing.
The Obamas sound "White"?
They have those Ebonic tendencies though, expressed in the tone of their voice.
IDK but kanye pre-kim kardashian sounded like a typical chi dude, which is mostly southern with some midwest influence