[Teacher317]

paved the way for millions of white settlers from Europe, and the movement of freed black slaves to the north such that the blacks stopped being a majority in southern states.

Ummm, blacks were only the majority in SC (58%) and MS (55%) in 1860... which was still the case three generations later in 1920 (51 and 52%, respectively), and then those numbers started to fall under 50% in 1930. Seems like it didn't change much at all.

It wasn't until after WWII that only Mississippi was above 40% black (49% in 1940, down to 37% in 1970). Blaming the Civil War for migrations that mostly happened between WWI and WWII seems ludicrous.

[Zhang Fei]

[Ummm, blacks were only the majority in SC (58%) and MS (55%) in 1860... which was still the case three generations later in 1920 (51 and 52%, respectively), and then those numbers started to fall under 50% in 1930. Seems like it didn’t change much at all.]

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Black fertility being what it is, having the North as an escape valve kept these numbers from being far higher. NYC blacks speak with a southern black accent for a very good reason. They used to be 2% of NYC’s population in 1900. They are now 25%.
https://en.wikipedia.org/wiki/Demographic_history_of_New_York_City#Citywide