What makes this lie even more disgusting is the fact that most of the laws regulating firearms and concealed carry came about post civil war in former Confederate states and their purpose was to keep blacks disarmed.
Joyce Malcolm traced the history of the militia in her classic "To Keep and Bear Arms" and there is simply no historical doubt--none--that the founders looked on the militia as a preferred alternative to a standing army, which was the classic fear of both English and American Whigs. It had nothing to do with slavery.