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There is only one example of a modern industrial nation increasing its birthrate to great result by known means.

Post-WWII America’s Levittown was the model for this baby boom. Soon suburbs across the US recreated this model to similar effect. Its major elements:

1) One breadwinner married couples. The husbands worked in mostly white collar jobs, and the wives were homemakers. Taxes were low enough for this to happen.
2) Child-centric communities with limited entertainments for unmarried adults.
3) Few people in the community who were neither raising children or not interested in raising children.

Importantly, to recreate this situation intentionally in today’s world, no matter where it was done, would probably require subtle, but authoritarian controls behind the scenes.

It would be worth it to create a city from scratch, solely with the intention of making it a national incubator. Most of the jobs would be make-work and low intensity, and adults who were not married or not inclined to have children would need to be kept out.

Women would mostly need to be excluded from the work force, but families would need to get by on the income from just the father. Luxuries would be strictly limited, as would unhealthy recreations that didn’t lead to procreation. OB/GYN, pre-natal, maternity, pediatric and fertility medicine would be good, but there would be no birth control or abortion allowed.

Religion would be an important element, and the government would encourage religious leaders to advocate procreation. Schools would likewise have to be good quality, with plenty of patriotic instruction and sports.

Such a city would need to be isolated and protected enough for the project to work, and would need good management to maintain child production rates, not just have it limited to a “wave” of children.