Second generation and later of immigrants very rapidly adopt the social customs of the country they live in. This is seen everywhere. Vietnamese to Australia. Filipinas to the US. Congolese to Nigeria. Marocs to Spain.
These days we can move beyond survival and into real fulfillment. And we need to, as well. We can't live without knowledge anymore. Critical thought brought us this far. And we're really far from extinction. We could do with a few billion less people if we want to be sustainable. The transition will be tough for those getting old but it'll be worth it.
There just aren't throngs of young people living "traditionally" (non-individualistically) yet not having kids.
The rhetoric is still about "increasing female labor force participation".[1]
For clarity, the thing you do first is your priority. This is known as "revealed preference" in economics. And careers are individual things, not collective.
Also for background, fertility declines secularly from mid-teens to mid forties where it goes to zero. Waiting has two costs: you have fewer years in which to have children, and you are less likely to have them in each year. (There is a third one in increased risk of congenital illness in the child too.) Nearly every woman knows these things.
1. https://thechinaproject.com/2022/03/08/women-at-work-in-chin...
Can you really not see how this doesn't work in modern society? Women fought hard to have rights.
In other countries it continued even longer.
Exceptionally idiotic communist policies probably played a much bigger role. At least initially. If you ban families from having more than a single child and perform forced abortions or impose massive fines on those that dare to have a second one. Well.. I’m not sure what else you could expect