Answer:
African American culture developed in cities in the south because after slavery was abolished, many blacks had no where to go, so they just stayed in the south. (as you know, slaves were wanted in the south, not the north) and over time, their original culture faded away, while a new one was being created. And as time continues to go on, different cultures of African Americans tend to change more and more because of the social norms and different things going on in the world
Hope this helps!!!