Literally the more developed a country is, the lower it's birth rate. More education, especially women's education, less religiosity and better contraceptive pr

Literally the more developed a country is, the lower it's birth rate. More education, especially women's education, less religiosity and better contraceptive prevalence is all you need. The US is already at 1.6 births per woman, well below the replacement rate of 2.1 You don't need "less breeding habitat" you just need more development.