The Constitution Was Never Pro-Slavery

National Review

It was deliberately written to avoid establishing a legal precedent for ownership of human beings

. . . "What often comes next is a demand to rid the Constitution of the vestigial props for slavery that have somehow survived into our times, usually beginning with the Electoral College. Or maybe, as with University of Texas law professor Sanford Levinson, it leads to a call for junking the whole “We the People” business and starting over with a new constitutional convention.
"The accusing finger that links slavery and the Constitution would have surprised no one more than the delegates to the Constitutional Convention. At the outbreak of the Revolution, every one of the newly independent states had legalized slavery. (The numbers varied widely from place to place: Georgia had 18,000 slaves, Pennsylvania 6,000, Virginia 200,000, Massachusetts 5,200, and New York 17,000.)
"But opinion about the moral legitimacy of slavery was shifting. Benjamin Franklin bought and sold slaves in colonial Philadelphia, but by 1772 he had begun denouncing slavery as “a constant butchery of the human species' ”  . . .