...it was said that his origins in southern central-Pennsylvania had more cultural affinities with the slaveholders, just across the border in Maryland and 'Greater Virginia'-now West Virginia. But the reference sites I checked did not give any indications to that bias, of which I once learned. Because Buchanan did have what was known as dough-face sympathies,.
That perception of holding those sympathies I would also attribute to Trump and his alt-Right equivocations. If so, then #45th could be mirroring what #15 let develop, but without the rationale one could attribute to #15, Buchanan, as he being a person of his time with no historical record to give him a different predisposition from the one he took from 1857-1861. Unlike #15, #45-Trump has had the resources of the archives of history to give him a broader perspective. Yet, Trumps insulated privilege, plus channeled focus and business obsessions, have rendered him on the same level of equivalency of of historical moral knowledge and perspective as the President #15 of the 1857-1861 period.

What was soberly tragic for Buchanan, who had a noted foreign and domestic political service prior to his Presidency; for which a kind historical understanding could be made, will not be such for #45Trump whose ow narrow, political motivations are the guide for his political (a)moralities.