It doesn't seem to be the people waving around pictures of aborted fetuses. It so happens that birth rates are down, too, and the overall answer seems to be an increase in the of contraception by the most at-risk-of-pregnancy groups of women.
I don't imagine that will get pro-life groups actively encouraging the use of contraceptives, though.
Sorry, but the Abortion Rate Is Not Going Down Because Women “Choose Life”
The abortion rate is down and anti-abortion folks would very much like to take credit for it. Last week, David Frum at the Atlantic wrote a piece arguing that “the pro-life movement really does seem to have changed American minds about the morality of abortion” and that, along with a…