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Joel A. Rogers and Dr. Auset Bakhufu have both written books documenting that at least five former presidents of the United States had Black people among their ancestors.

Are they at the "Lovenstein Institute"?

Andrew Jackson's parents were born in Ireland (Scots-Irish). That makes it very unlikely that he had African-American ancestry.

The story about Harding has been around for a long time. It was spread by a professor who hated him. We still don't know if it has any credibility at all, but it may be one reason for Harding's insecurity. It's been said that many early settlers of the Middle West may have been part-Black and blended into the White population over the years, but who can say whether they included Harding's own ancestors?

The story about Coolidge is based on the lack of knowledge of his maternal grandfather's ancestry and the man's last name: Moor. That's not much. But for what it's worth, here's Coolidge's mother, Victoria Josephine Moor Coolidge:

Again, who can really say?

[AnAmericanMother]

The problem with the Coolidge argument (aside from the obvious fact that his mama has about the most English features I've ever seen) is that "moor" equally applies to certain windswept, heather-encrusted features of the landscape in England . . . .

I think Harding himself had the last word. He didn't know himself - how could we know?