Well, African isn't really an ethnicity. If per example, slavery mostly focused around a certain African tribe specifically not because of opportunity, but because of the nature of the tribe itself, then there would be a claim.
Once I bought Iman's makeup book 'The Beauty of Colour', and it featured every race except white. I feel persecuted.
By denying the holocaust they inflame the jewish community whose decimated population at the end of WWII fueled the clarion call to establish a jewish state Hotwater
And the mass graves at the concentration camps were merely german dissidents, political prisoners, and homosexuals Hotwater