I would say there are technical differences but also similarities between American slavery and abortion.
According to one source I read > The Lunatic Express > slave traders would give guns to members of a tribe and have them attack a village of a different tribe and take slaves. The traders did not get themselves killed, doing that. There was fighting and killing involved during the attacks. The attackers got killed, too; so that after a while the attackers' villages would not have enough men to take care of their women and children. However there were strong tribes whose leaders saw through all that; they were tough enough not to give in to attacks, plus they knew better than to waste their warriors in slave raiding. Meanwhile, others did fool themselves into going along with the traders; and then I see it is possible how ones fooled themselves into getting so many killed in fighting to continue slavery and their bigotry >
Ones seem to so treasure their feeling of superiority, that they are willing to kill and get their own children killed in order to maintain it, of all things.
And the captured villagers would be marched a long way, while carrying heavy elephant tusks. Ones would die; others would make it to the ships.
So, there was murder and degradation of village cultures involved, back in Africa, in order to get slaves to the United States. May be a number of southerners did not know that, if it is true. After all, people are not all alike.
But I see that there can be feeling of superiority and cultural degradation connected with abortion. Ones can discriminate against unwed pregnant women so the women can feel desperate to get rid of the shame. Ones have even used coat hangers to try to kill their unborn, and have themselves bled to death. So, fear of losing acceptance can turn a person into a killer, even suicidal. But we see no laws against discriminating against unwed pregnant women, as far as I know.
There remains a culture of how certain unloving people can hold a woman's acceptance hostage, in order to get her to meet their demand that she kill her own unborn with whom she could learn how to love while she discovers who really loves her. Unsure love, then, could be part of America's main security problem, because of what ones can do when they are not sure of having love. Abortion could be just one symptom of how many citizens do not know how to love.
And when people do not love ones of another group, they can become capable of killing those people > maybe Africans, or the unborn. The solution, then, is not only social reform. Outward conforming can not make us love the way Jesus desires. But our example can help, while we each seek God's real correction so we are not merely performing some do-it-ourselves thing of just changing our gestures.