This study is based on fantasy liberal lore - IOW tell a lie often enough and it becomes the defacto truth.
My families did own slaves; lots of them. I didnt kniw this until my wife traced our family roots and i saw the wills where slaves were given to the heirs and sold or traded for many generations. I had always wondered why my father and grandfather despised blacks and then I realized it was learned behavior handed down through many generations. Its not something i’m proud of but it is what it is. Those were different times.