Answer: After the terrible Civil War, from 1861 to 1865, the United States went through the southern reconstruction phase; at the same time segregation was being born. The war-torn south as the scene of the fighting has become the subject of debate among politicians. It had to be rebuilt; but within the new order, the war-winning northerly capitalist order.
At this stage there were many problems with African Americans in the south, the approval of Jim Crow laws, racial segregation, the emergence of the Ku Klux Klan organization. All of this drove Great Migration, which was the shift of African Americans from South to North.