What caused the Civil War has relevance. What happened in Reconstruction has relevance. But none of that involves ammunition or battle flags. Hence, both cause and effect of that war finds virtually no American consensus to this day. You see, we don't study peace or reconciliation.
War is much better theater.
It comes with pictures. Look around the higher education landscape. Only a couple dozen universities offer a major in peace studies. By that we mean conflict resolution, not chants and placards. Most of those that really emphasis peace studies are private colleges.