Answer :
The Great Migration, often known as the Black Migration or the Great Northward Migration. The migration's historic impact was enhanced by the fact that the migrants mostly settled in the country's largest cities at the time.
Option D is the correct answer because when comparing Northern jobs versus Southern jobs, Northern cities were numerous benefits, including pay that may be double or more.
African Americans moved to the Northern Cities for a variety of reasons, including agricultural slump, sharecropping, flooding, and boll weevil infestations.
Therefore, the great mitigation is described as for better possibilities, African Americans moved to northern cities.
For more information regarding the Great mitigation, refer to the link:
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