The book shows how segregation harmed blacks in the south more intensely than blacks in the north. This made the southern states more difficult to overcome the Great Depression.
We can arrive at this answer because:
This meant that black people had many economic difficulties and lived a life with many limitations, which kept them as an easy target for racism and prejudice. However, the white population was not enough to reverse the problems with the great depression, becoming a more backward region economically and socially compared to the north of the country.
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