theunitofcaring has a post trying to analyse the pro-life movement from a charitable yet pro-choice perspective and while it's a good post that I think covers interesting ground I was more interested in this disclaimer:

I say 'American politics around abortion’ because I get the sense they’re quite unique. All of my friends in other countries say 'oh, yeah, here it’s legal only for the mother’s health, but 'I’m depressed’ counts, so anyone can get it. Keeps everyone happy.’ That would not keep pro-life people in America happy.

I am, as you might know, not American. Yet if you told me "We're going to allow abortions only for the mother's health, but in practice be very liberal about what counts as health" my prediction would not be "ah, yes, a good compromise" but rather "pro-lifers will immediately protest this as a way to try to sneak in the legalisation of abortion". I know, because we keep getting news stories about doctors trying to perform an abortion to protect the mother's health and pro-lifers trying to stop them. Also because here's an article where pro-lifers are against the idea of allowing abortion based on risks to mental health because they see it as a stealth way of legalising abortion.

Most of the opposition to abortion in Argentina is driven by Catholicism, yet America is not a primarily Catholic country, so that does not explain the similarity. Either way I am surprised at the claims of uniqueness; my best guess would have been that pro-life people would behave similarly to the kind I'm familiar with no matter where