It's legal, but under very strict rules. When a pregnancy is beyond a certain set of weeks (I have to look up how many) abortion is no longer (legally) possible. There are still loads of people against it. Now the US has only 2 parties that really matter (Democrats and Republicans), but my country (the Netherlands) has quite a lot more in the 2nd chamber (the Dutch parliament) and the 1st chamber (the Dutch senate), and some of them have been founded under a strong Christian Ideology and one of them is part of the current government, and they are heavily against abortion, but the laws are in that stage, that it does no longer seem politically possible to change those anymore, but that does not mean abortion is not a very sensitive issue here either. Some other parties are founded in a more progressive ideology and they are more for legalization although under strict rules. One of the former ministers who made the current laws (on abortion and most of all euthanasia) happen was murdered for her beliefs, long after she retired as minister. "God told me to punish her" said her killer, although it should be noted that this person was in a pretty bad mental stage and was already condemned for killing his own sister when he killed that former minister, so I can't say his deed is a proper representation for the sentiment.
Aside from the law, I also know that there has been a lot of research on the topic of the psychological consequences of abortion for mother (and also the father) of the unborn child, and that's how I know that the choice for abortion is not an easy one to make. A woman now in her forties and mother of very healthy children still feels guilt over an abortion she underwent when she was only 14, but maybe you get why she chose that route back then. We also know some marriages came to an end thanks to abortion, due to male and female being in disagreement and the male leaving in anger when his unborn child was murdered. I believe that when you go to a doctor to undergo abortion doctors are obligated to warn you for the consequences the decision may have, but I'm not sure about that one.
Long story short, it *is* legal, but under pretty strict regulations.