I believe the answer is D. New England. New England is where the original 13 colonies are located, and was the first area to began having factories and cities instead of farmland.
The states still had the freedom to create their own laws and have their own constitutions (as long as they don't go against by the Constitution). The states have reserved powers.
The rights of the individuals are respected mainly by being listed in the constitution's first ten amendments, or Bill of Rights.
Both sides would reconcile and freedom and equality would prevail.
The WPB or War Production Board set the products that would be needed for war and they determined their pricing.
So I agree with you, the answer is A.
But I must admit I was a bit iffy between A and D but I'd still say that A is a better choice.
Hope this helped
The answer would be Latin America
Because Approximately half of immigrants living in the United States are from Mexico or other Latin American countries. Many Central Americans are fleeing because of desperate social and economic circumstances created in part by U.S. foreign policy in Central America over many decades.