Roe was decided on two main legal points:
1) that an unborn child was not a “person” for the purpose of being protected by or falling under the US Constitution. It was therefore the property of the mother;
2) that a woman has a right to privacy.
While the right to privacy is not directly enumerated in the Constitution, it is implied in the Fourth Amendment. Free people have always claimed the right. It pre-exists apart from the Constitution and thus is reserved to the People according to Amendment X.
Having said that, in declaring that an unborn child is not a person, the Court has used the same logic as it did in Dred Scott when runaway Negro slaves were declared to be the property of their owners.
Just as with same-sex marriage, liberals were in such a hurry to fabricate a new right that they did not care what logic they trampled underfoot. The issue could have been decided by the States. New York State had already legalized abortion when Roe was argued.
Yet another sad chapter in the history of the Supreme Court.
Main legal point 1) If A strikes B with the intent to do harm and as a result B miscarries her five-week-old fetus, On these facts, A would be responsible for the death of a “person” both civilly and criminally.
In effect, Roe v. Wade gave a woman the right to redefine the legal “person” in her womb as a parasite. In every other scenario that child is afforded all the rights vested in all postnatal persons. With enthusiasm.