Emil O W Kirkegaard

cheap subsidized daycare and paid maternity leave?

I mean, we have had that for years.

I don't know Quebec, but I have my fingers crossed that the leave+daycare allows more educated (ie intelligent) women to have more than zero kids while working. Not sure what else can achieve that goal.

Rulers in the past have succeeded in increasing fertility. What were their methods? Does banning contraception work? Does removing sex education work? These are not first on the list of things secular people are looking for, but they might work. I'd try aggressive tax benefits.

"Hungary’s populist prime minister, Viktor Orbán, has promised that women who have four or more children will never pay income tax again, in a move aimed at boosting the country’s population."

"He also promised favourable mortgage terms for families with multiple children, support for families with three or more children to buy a car, and increased funding for daycare centres and kindergartens."

Is that now or already been tried? That's basically stuff I would try. Hungary doesn't have toxic feminism, or massive issues with immigrants, their biggest problem is national decline linked to low fertility.

any older data or would looking back toward the effect of industrialization without adjusting for the balance of declining mortality just be a downer?

That is likely due to immigration who help with a higher rate than average

These values are for Danish women.

There is always strong selection for breeders, especially when fertility levels are low