https://www.americanthinker.com/articles/2023/05/the_path_to_national_suicide.html
Without unrestricted immigration, nations like the United States cannot survive unless women have about 2.1 children each (the .1 reflects women who do not have children). The bad news is that the U.S. is falling short in reproducing itself. Occasional exceptions such as the Baby Boom aside, U.S. fertility rates have dropped over the last two centuries and show no sign of rising to the 2.1 replacement level. We are currently at 1.6.
The baby shortfall has huge consequences beyond potentially filling the nation with immigrants. An aging population brings higher healthcare costs, budgets devoured by pensions, shrinking tax bases, labor shortages, empty schools and universities, and a stagnant economy.
Moreover, Africa aside, depopulation is worldwide and, apparently unfixable. Countries as diverse as Japan and Russia have tried the “obvious” solutions such as free childcare and subsidies, but to no avail. Scandinavian countries offer lavish child-friendly policies but likewise fail to move the needle. Between 2006 and 2021, South Korea spent $200 billion for maternity leave, paid childcare, and similar pro-natal measures, but the fertility rate dropped from 1.1 to .81.
This should be a major political issue regardless of one’s ideology. The Left surely needs a healthy economy to finance its welfare state while businesses depend on factory and service workers. Nobody wants a shrinking workforce whose principal responsibility is to fund a growing geriatric population.