On abortion, the USA are split on pro-life versus pro-choice. State legislatures pass laws safe in the knowledge that they will be struck down the next day. they were playing to a grandstand made up of values voters.
When the supreme court became a little vague on some procedural aspects of abortion law in the early 1990s, the state legislatures started showing much more restraint because the median voter would be annoyed.
Where Roe v. Wade to fall, some states would permit abortion, some would not. The Center for Reproductive Rights predicts that 21 states are likely to outlaw abortion immediately where Roe v. Wade to fall. This assessment is based not only on current law, but on the political makeup of the state legislatures. On the other hand, abortion is likely to remain legal in many states, according to these groups.