Declining Birth Rates

This is wrong. In the west, and much of the developing world now, reproduction is below replacement rate.https://www.macrotrends.net/countries/USA/united-states/fert...https://www.nytimes.com&#

Fertility rates fall as countries get richer - it’s not a coincedense that poor countries have higher birth rates. The biggest drop in global population growth rate in the last 20 years came from massive drops in developing countries like India.

That fails when every country has falling birth rates

Birth rates drop as countries become wealthier. There's no need to reach for culture essentialist nonsense.

some low birthrate countries are basically saying that already...

I would assume that the birth rate going down considerably amongst poorer people is a big factor too.https://www.statista.com/statistics/562541/birth-rate-by-pov...

Hard disagree. Birth rates are at their lowest throughout the developed world. In some cases, it’s below the replacement level. The developing world’s birth rate is also dropping as those regions become more developed (China for example, which recently switched to incentivizing additional children).

Your hypothesis is completely unmoored from reality. The only durable correlation between birth rates and living standards is negative - wealthier people consistently have fewer kids.https://ourworldindata.org/fertility-rate

Every country on earth (but 2?) have birth rates asymptotically approaching just-under-replacement. This is nothing to do with politics of the sort in the title. It has to do with information and accessibility to birth control.

Probably not. Birth rate depends on a lot of variables, including how wealthy a society is. If birth rates dropped to a level that was making us poorer, people would start reproducing more to compensate. Also, wealthy societies can manage the birth rate through tax cuts and other incentives.