The idea that history bends towards justice may be a dangerous delusion, as one person's justice can be another's atrocity. However, looking at the accomplishments and possibilities of change in one human lifespan gives some hope. The legacy system of slavery, deeply entrenched in society, was flipped, showing that change is possible even under financial and institutional constraints.
The Atlantic Slave Trade mixes centuries of human bondage with violence, economics, commerce, geo-political competition, liberty, morality, injustice, revolution, tragedy and bloody reckonings. That sounds like a lot, yet this show merely scratches the surface of this enormous subject.