OK, so you're advocating for abstention from sex. One of the most basic human inclinations. And not just in "western civilization." For everyone who doesn't want a child as the outcome. Obviously, or not, for you, this excludes non-consensual sex, such as rape and incest?
Also, and this is not aimed at you, but I find this a convenient position for middle-aged men, who already sowed their "wild oats," and now tell others how to behave. To them I would aay: tell me you never had sex with a woman you didn't intend to have a child with? No matter how "well-protected."
But this is not only a first-world issue. It's a third-world issue, too. Men and women have sex, and women bear the brunt of the effects. That's why abortion is a women's health issue, and a feminist issue. Men spread their seed and move on, while women are left to take care of the babies, and squash their own dreams and ambitions.
I'm not sure what "empires" have to do with it, tbh.