Answer:
A. Abraham Lincoln was elected president of the United States
Answer: The correct answer is A: the United States extended its border.
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The answer should be D.), sea. Often called the sea between the lands.
Answer: Racism and economic troubles.
Explanation:
These are the elementary reasons for the migration of African Americans to the north. Segregation was very pronounced in the South. A huge number of African Americans have experienced some discrimination in the South. A large number of that population were lynched, so living conditions were impossible. In such circumstances, economic reasons were the cause-effect relationship. A society that discriminates against the population because of skin color did not provide even the minimum economic conditions.