The way this statement, "Black Lives Matter," is being used by the media (propaganda), and others, assumes that there must have been a time when black lives "did not matter." Look at the way they present this thought to us. We all have access to the same sources of information and no where have I seen the statement "itself examined.
Maybe in earlier times, when African chiefs and people sold their excess and unwanted citizens to Muslim slavers, black lives did not matter. But this does not account for the slaves themselves. If they died, their fellow tribesmen and the Muslims would not have made any profit. So back then black lives mattered.
Am going to discuss the practice of slavery as well as I can... the history of slavery will add an important dimension to this post.
The point I would like to make is that Black Lives Do Matter, and whomever is putting it into anyone's head that All lives don't matter is in error!