If I knew how to solve the problem, I'd have proposed it. Yet, this is certainly a political issue. As populations decline, the smaller and smaller generations will be asked to support older generations, keep government services afloat, and so on. If nothing is done, at some point, the advanced, post industrial societies will become poor agrarian societies, infrastructure will decay, and governments will collapse. Then, people will begin having large families again because they will have no choice. Farms need hands.

Banning birth control and reversing efforts to enable women's equality in the work force are big ones. But we also see it in policies like the Trump Accounts and various proposals to pay people who have larger families. And you can see it but up against immigration policy too, where people who hate immigrants seek to replace the economic benefits of immigration with policies that promote a larger white population in the next generation.