"While continental Africanisms may have trickled down into modern Ebonics, Southern country-dialect definately had an impact as well."

I agree.

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"Fixin" is another word that appears to be a Southern {American} thing regardless of race. Example: "I'm fixin to go to the store".

And what about "tote"= "carry"? That's also a Southern {American} word that I believe transcends race/ethnicity. I have a book on African words that are found in American English. That book documents this word as being from the same Wolof {Senegal & The Gambia} language that gave us "dig" {meaning "to understand" or "to like"}.