From the Abolitionist Society of Oklahoma:
This foundational belief or assertion supported both the legal justification of human slavery and abortion. Consider the Supreme Court of the United States' declaration that black people enslaved in the South were:
“A SUBORDINATE AND INFERIOR CLASS OF BEINGS”(US Supreme Court decision, 1857. Dred Scott v. Stanford)
The Supreme Court of the United States similarly declared the unborn as a deficient class of human beings when Roe v. Wade declared them to be only “potential” humans.
“THE FETUS, AT MOST, REPRESENTS ONLY THE POTENTIALITY OF LIFE.”(US Supreme Court decision, 1973. Roe v. Wade)