I said immigration would end up buoying the US population. The US is expected to hit 400 million by 2100 and keep growing. Europe is expected to decline, as is East Asia,

My personal ideas for how to boost the birthrate would be encouraging baby making through tax cuts, and probably subsidies and free parenting classes. I'm hoping automation could help fix it, but I can't rely on that alone.

Worst come to worst illegalize condoms and watch the birthrate skyrocket.