I thought R v W outlawed third trimester abortions, no?
No, it ruled that states could restrict 3rd trimester abortions provided they weren't necessary to protect the woman's health. Subsequent decisions ruled that this exception had to include "mental health," which in effect makes it impossible to outlaw 3rd trimester abortions, since it's very easy to claim an abortion is necessary for "mental health."
Second and third. But now it has been expanded to the point where it covers everything up to and including the moment of birth, with the partial birth abortion decisions.
Pardon me... It did not “prohibit” second and third trimester abortions. It merely said that the goverment could not regulate abortions in the first trimester.