Well, you did not provide any context on that. So I will have to take a wild guess as to what you are talking about.
First of all, "retribution" is defined as "punishment". I assume you don't mean that but the opposite, which would be some form of "compensation". I think the word you ment to say is "restitution".
If you are refering to slavery in the United States, that happened just the before the Civil War - which was fought about 140-145 years ago, in the 1860s. No one from that period is still alive. Many people died fighting it - it had a number of very bloody battles where staggering numbers of people died. A lot of people died specifically to end slavery.
Slavery was, of course, unjust. It was also cruel. The limit of cruelty involved depended on who was involved but it is hard to imagine what it was like no matter what.
Entire generations in the U.S. were forced to live as slaves without the rights that all human beings were entitled to then or are entitled to now.
Slavery was also a big problem in Africa. Unlike the United States, there is still a slave trade in some parts of Africa today. Slavery in Africa also predated slavery in the U.S. as well. That does not excuse the immorality of it. After all, two wrongs do not make a right!
The U.S. has done a lot of reform as a form of restitution for the wrongs of the period before the civil war and up through the civil rights movement of the 1960s.
Institutions are forbidden from descriminating in the United States, though descrimination to make things "more fair" is tolerated if not outright encouraged. The idea is that eventually, things will level out.
Now, not all people of African descent had ancestors that were ever in the United States during the period where descrimination and racism ran rampant. So, restitution for them would hardly seem called for - in no way did what went on there here affect them or their families.
I guess theoretically they would be less entitled to "restitution" in the formal sense, than someone whose family had lived in the US and been taken advantage of for generations. After all, someone else acrued the wealth from the latters' labors instead of it being collected and handed down .
However, it is hard enough to keep track of who is here now. So, there is no way to give people more or less benefits based on where relatives of theirs were a century and a half ago or more.
These days, I think most people want to make this a great country to live in and the world a nice place for everyone to live in.
Anyway, I hope that explains what restitution is being made to the group of people you are talking about. I hope that you do not envision any form of retribution being due to anyone for their race, which is after all just ancestry.