Looks like Isabel Wilkerson...

...will have to write a sequel to The Warmth of Other Suns, her 2010 best seller about the Great Migration of southern blacks to the North from 1915 to 1970.

From an article in the Times today, "Many U. S. Blacks Moving to South, Reversing Trend":

 The percentage of the nation’s black population living in the South has hit its highest point in half a century, according to census data released Thursday, as younger and more educated black residents move out of declining cities in the Northeast and Midwest in search of better opportunities.
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The five counties with the largest black populations in 2000 — Cook in Illinois, Los Angeles, Wayne in Michigan, Kings in New York and Philadelphia — all lost black population in the last decade. Among the 25 counties with the biggest increase in black population, three-quarters are in the South.