[xjlin0]

Looking between 1960 to 2020, the birth rate are declining everywhere except Muslim world, not just "western societies". Russia, China, Japan, etc, you name it. Even India is slowing down on the population growth a bit recently.

[Apocryphon]

Yeah, improvements to quality of life and socioeconomic development lead to lower fertility. Pretty sure this is an Industrial Revolution phenomenon that predates chemical contraception.

[User23]

There was a moderate downward trend over a couple centuries from around 7 to 4 children per woman. And then in the ‘60s it fell off a cliff[1].

[1] https://data.worldbank.org/indicator/SP.DYN.TFRT.IN?location...