History shows that slavery, in one form or another, was practiced in history (recent or ancient) by most cultures. Thankfully, it is a taboo in most societies today (though underground slavery still exists).

So, I am puzzled at why the focus of this thread is on NA native peoples, either before settlers arrived or before? If it is a search for knowledge, I am fine with that. But, I trust that there are not other reasons for bringing this up?