Additional amendment as part of the Bill of Rights:
"Congress shall make no law, as to infringe on the right of the people, to own and buy Negro slaves, nor shall Government in any way seek to regulate, the treatment of slaves or bondservants by their owners; such matters, shall be left to the conscience, of the individual Citizen."
This might border on ASB, but the point is, what consequences does it have for slavery in the US?