Question

Which domestic shift most affected the demographic makeup of northern US cities in the early 1900s?

Answer 1

The answer is A. migration of African Americans from southern farms to northern factories

Much African-American were brought to the American shores. They were brought from Slave Trade from the Europeans who were engaged in business with the African kingdoms.  The number grew when the African Americans have started to settle in the Northern part of the US during the Great Compromise.