Imagine a memorial for each murdered black person on a metal plaque on the sidewalk outside the place they last were known to live that included on it:
Their Name
birthday,
Day of death,
Place of death,
Means of death.
One 3 square inch brass plague for each one.
That is the memorial that the capital of Germany has on the sidewalks throughout the city to remember the individual Jews who died at the hand of the Nazis. Perhaps someone in the USA has enough personal wealth to finance this and the government can work with that person to lobby local governments to establish fitting memorials of history.
America having had one of the strongest economies in the modern world, owes her economic success to the slaves who built the fortunes of others. These slaves need to be remembered for their contribution. The rest of us need to remember their sacrifice and to remember to never let that kind of evil happen again.