Think about it. Millions of blacks moving to cities in the North and West due to economic downturn and lynchings/pogroms (refugee crisis). Sending money back South (remittances). Living in homes with multiple people. Whites complaining about migrants stealing jobs that they would never work themselves. Physical and educational improvements in life comes with said migrations. And, finally a large network of blacks is created from state to state (intranational diaspora). Idk about you but it sounds like the classic American immigrant story just with a twist.