A historian notes that many African Americans moved from southern rural areas of the United States to large urban centers farther north between 1910
and 1930. He hypothesizes that the availability of high wages in northern
factories was the fundamental cause of this population shift. Which two
themes would this historian focus on as he researches his hypothesis?
A. The themes of American and national identity, and of work,
exchange, and technology
B. The themes of politics and power, and of culture and society
C. The themes of migration and settlement, and of America in the
world
D. The themes of migration and settlement, and of work, exchange,
and technology

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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the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

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