I've just read your post from July 2008 about double negatives {as in this example posted above "my mom gave me some gold, she said im pretty old but i didnt want no gold"...
I agree with you that this grammatical construct is not just used by African Americans. While "negative concords" {more commonly known as "double negation" are often cited as a characteristic of African American Vernacular English {AAVE}, it is also a feature of nonstandard [non-African] American English.
However, I want to point out the possiblility that at least one source for using double negatives could come from African languages where that usage isn't grammatically incorrect. To quote one sentence of this article on African American Vernacular English:
"It has been suggested that AAVE has grammatical structures in common with West African languages or even that AAVE is best described as an African based language with English words".
While, I don't know enough about the subject of African American vernacular English, it is interesting to read about the possibility of West African sources for not just various words that have entered the English language, but also for various grammatical features.