Allow me to blow your 'history lesson' right out of the water.  All of the slaves were not black and a good many never were within 1000 miles of Africa.  

The reality is those who are 'black' are given every possible government advantage while those born into similarly dismal backgrounds are not and that is flat racist discrimination.  And unsurprisingly it is again the party of discrimination selling it as roses rather than the turd it is.