That's how we got ghettos here on the west coast. During WWII, blacks came west for work from the southeast because whites became soldiers, Japanese-Americans went to concentration camps. Blacks got housing near shipyards (Hunters Point shipyard in SF, Richmond ship-building, Alameda docks, etc.). All those places got ghettos, although the Hunters Point area in San Francisco has seen an influx of asians as blacks have left, and the area is improving.
It's really shocking behavior. The town where I live, for whatever reason, has seen an influx of educated African Christians. They are nice families, well spoken with British accents, have polite children and keep their properties neat. Even their less-educated nannies from Africa and visiting parents who don't speak English are respectable Christians. They don't like American blacks and the feeling is mutual, since the African-born blacks make the American blacks' constant grievances sound false and self-indulgent. So it's not genetic; it's just bad attitudes and the American blacks allowing themselves to be corrupted by Democrat identity politics continuing to fight the battles for civil rights as if the laws and social customs had never changed over the past 160 years. The changes have been dramatic, to those of us who are older than 60; then you get old white ignoramuses like Biden and Hillary denouncing whites as if it were 1866.