I stumbled across this website that show the numbers and percentages of black migrants that left the South for other regions of the U.S. The best mapping i came across and cover 100 years (1900-2000). Also contain the maps of other in migrations that occured in the U.S history as well.
http://depts.washington.edu/moving1/map_black_migration.shtmlI don't come on as often as I used to, but great finds. One of the push factors from Mississippi was the Great Mississippi Flood of 1927. It was truly devastating, especially to poor people of color who lived in cheap shacks that couldn't withstand the flooding. Most of those that headed north went to Chicago.
https://en.wikipedia.org/wiki/Great_Mississippi_Flood_of_1927
