The Abolitionist movement during the Antebellum period, was a critical time in American history. The goal of this movement was to emancipate all slaves immediately, and end discrimination, as well as segregation. The brave men and women involved in this movement were called abolitionists and antislavery advocates.
The US followed isolationism after WW1 because the public didn't want to be apart of another war which concerned Europe, and a war looked inevitable.
I think that the answer is probably B.
