I don’t know if the numbers are large enough to call it a mass movement but something interesting has been underway for at least a decade now: African-Americans are returning to the South decades after the Great Migration to the urban North, sometimes even returning to their ancestral lands.  It should be less surprising than it sounds.  The Rust Belt has been losing jobs and people to the Sun Belt for decades now.  Why shouldn’t African-Americans be part of the demographic trend?