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Between 1910 and 1970, 6 million blacks fled the south due to its poverty and jim crow laws. The lilly white cities outside the Mason Dixon line suddenly had large black populations. This had tremendous social and political impacts. In 1910, 90% of all blacks lived in the South, by 1970 it was just over half.
Given what they were leaving behind, it's surprising to me that the exodus wasn't bigger. So let's do just that. Between 1940 and 1970, on average, the South's share of the black population fell by 8 percentage points every decade. If that had started in 1900, after all the Jim Crow laws had been implemented, the south's share would've dropped to just 34% by 1970.