Prior to Roe v. Wade, it was a state matter, that is, according to the 9th and 10th Amendments, they were reserved to the States or to the people to decide for themselves.
Roe v. Wade made it a federal issue. Because of a legally debatable penumbra, the right to privacy was applied to 3rd trimester abortions in Roe, extended in Casey v. Planned Parenthood.
Of course, facts are irrelevant to the radical pro-life crowd, just like any other radical group.
(I am solidly pro-life, but not to the point that I lose sight of reality).