The upside in the US is that there are some groups which still have a very high birth rate; fundamental Baptists and Catholics. The Democratic party actually commissioned a study which showed that there base was graying while the conservative base was actually getting younger.
If China put in a Social Security system, and quit brutalizing citizens - birth rates would go down. The best 'social security' in third world countries currently is still 'sons'...
My four are planning at least four each and after having old parents like me they want to start their families early and have many. I am helping out by providing them with land towards their houses.
Uh ... those results may have been true in 1977, but not today!
Their base of white liberals is shrinking due to demographic issues and them abandoning the Dem party. However, all of the assorted ethnic groups that are considered “diversity candidates” are breeding like rabbits on fertility drugs. In other words, the LaRaza contingent will take over the dem party, along with CAIR, NAACP, etc. and end up being the majority of the US population.