Immigrants can enrich a nation. But there is a difference between immigrants and colonists. The former are eager to learn<span> the ways of their adopted home, to integrate and perhaps assimilate — which does not require relinquishing their heritage or forgetting their roots. Colonists, by contrast, bring their culture with them and live under their own laws. Their loyalties lie elsewhere.</span>
The answer is B.
The Great Migration was the movement of six million African Americans from the Southern U.S. to the North. As you probably know, back in the 1900's, segregation of African Americans was on the rise. At the time, the North was not involved in this segregation, so African Americans migrated to the Northern states to escape discrimination.
Important reasons for studying history are recognizing patterns, connecting the past to the present and revealing past contributions of civilizations.
Both Abraham Lincoln and Jefferson Davis wanted to avoid a war between the North and the South.