HARLEM
In the north and northwest, African Americans migrated mostly to cities, especially the ones that were cheapest to get to by train: Boston, New York, and Philadelphia. Once African Americans began moving into Harlem, attracted by its cultural and artistic diversity, much of the white population emigrated. This caused property prices to fall, making it cheaper for more blacks to move to the neighborhood. In turn, property increased in value, once more. By the 1920s, Harlem held over 200,000 blacks. (Flynn, "The Harlem Renaissance: Black American Traditions.”)