This kind of----for want of a better term I will call it Ebonics---is not limited to those two locations. It, in one form or another, is common to predominantly black neighborhoods.
An introduction.
Just as a comment on this---a big part of Harlem is now called Spanish Harlem for obvious reasons and in the Bronx the the black population is now second to Latino which is more than 50% of the population. That is not all bad news---while I love good soul food all soul food is not good. The Latino restaurants have a far better "good" rating. One of my favorite dishes in the Bronx is mofongo which is Puerto Rician and made with plantains---which normally I am not a fan of but in mofongo they take on a whole different flavor.
"A pessimist sees the difficulty in every opportunity, an optimist sees the opportunity in every difficulty” ---Sir Winston Churchill
"Political extremism involves two prime ingredients: an excessively simple diagnosis of the world's ills, and a conviction that there are identifiable villains back of it all." ---John W. Gardner
“You can’t go back and change the beginning, but you can start where you are and change the ending.” ---C. S. Lewis