Since 2009, Colorado has had the single most effective anti-abortion program in the country. In its first four years (for which we now have full data), it reduced abortions by 42%, and teen pregnancies by 40%. And there is nothing particularly startling about the success, because it was done by the most obvious means possible: give contraception to women who want it but can't get access to it, namely teenagers and people who can't afford it.
"Startlingly," this turns out to work quite well, quite inexpensively, and make basically everyone happy. ("Startlingly" is in quotes because I suspect that if I asked someone who knew nothing about American politics, "what would you do to decrease the rate of unwanted pregnancies?," they would probably guess pretty much exactly what Colorado did, and be not at all startled that it worked)
(This is not actually a horribly new story, there are just some more numbers out. We've known that this has been working well for quite some time.)