The answer would be C, different economics, because the northern states were going through an economic boom, due to industrialization. The southern states were running on slave labor.
Immigrants from southern and eastern Europe were thought to be mostly anarchists. The immigrants would work for lower pay and that also impacted the 1919 Red Scare. The Sacco and Vanzetti trial typified the Red Scare era of 1919.
The answer is Regain its majority status. According to the new statistics, Census projected that the US nation will become "minority white" in the year 2050. In that year, there will be 49.9% of white people, 24.6% of Hispanics, 7.8% of Asians, 3.8% of multiracial people and 13.1% of black people.