“research studies have found that women of higher intelligence tend to have fewer children on average, meaning that population growth may be driven by those with a lower IQ.”
That’s the premise of the movie “Idiocracy”:
https://www.youtube.com/watch?v=icmRCixQrx8
Love that movie. It gets truer every day. We are already living in an idiocracy.
“Ideocracy” is a prophetic movie. People who should be having babies aren’t. Those who should never produce are.
In immigration matters, we are importing dumber people than we used to. Finally, the welfare state has greatly reduced personal initiative and self-reliance. All of these factors have reduced our collective IQ with predictable results for our civilization.