The answer to this question is option D: The themes of migration and settlement, and of work, exchange, and technology
The themes can be found in the reasons why the African Americans were moving.
They were migrating and moving to these large cities because of better paying work. The north had factories with high wages.
The jobs where available in factories. This shows that they were moving towards technologically advanced areas.
The population shift tells about an exchange from the south to the north. The people are leaving the South and moving into the north.
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