Not wishing to detract from the dreadful plight of coloured Americans, even up to and including fairly recent decades and in some instances, present day. If you ever have time to kill in Atlanta, I suggest a visit to the Martin Luther King Jr Historical park. The visitor centre includes a very well presented museum, that opened my eyes to unbelievable horrors that had washed over me as a child.
But as applies specifically to slavery, my understanding is that apart from that fairly recent (few hundred years) USA history, people abused as slaves have been no particular skin colour. In Roman times, was slavery associated with skin colour?
More recently, WW2, slavery was imposed on captured enemy troops, by Germany and Japan, and I don’t think they were selected by skin colour. I wonder whether those abused as slaves in WW2 would find the terms ‘master/slave’ , as applied to technology, offensive.