While that statement sounds over the top, it is quite actually true. There are a number of black businesses and even whole neighborhoods which were burned to the ground while Wilson's administration quite literally looked the other way. These were located in a number of places stretching from Oklahoma to Miami mostly, but not exclusively, in the south.
Warren G. Harding who, incidentally, has more proven black blood than BO has, put an end to most of these atrocities by simply enforcing existing laws. Not that the modern successors to W.E.B. Dubois will ever give Harding an ounce of credit for it . . .
Since when has Harding been proven to have any “black blood” at all? An ancestor of his was alleged to have some black ancestry but for all anyone knows that was a complete fabrication (made to discredit him at a time of extreme racial prejudice). Harding was aware of that allegation but did not know if there was any truth to it or not. He had no children. Has someone done DNA testing on some of his relatives and come up with proof of African ancestry?