If we lose
by
I'm pretty sure that there isn't one. I don't need to claim causation here, just correlation. There are plenty of countries out there with birth rates above replacement, and contraception and abortion exist there as well as here.
As far as economic opportunity, I think that societies with womens lib end up forcing families to be two income families and staying at home becomes a luxury for the rich.
Love Pence just ignoring the bullshit question