> while still having kids Are they? Birth rates are below replacement everywhere outside of handful of places like Afghanistan. Even with lots of immigration t

> while still having kids Are they? Birth rates are below replacement everywhere outside of handful of places like Afghanistan. Even with lots of immigration the US faces a Japanese style demographic crisis. Large populations may be a big problem but shrinking them through low birthrates definitely causes its own problems. The workers-per-retiree is going to fall from 3 today to 2 by 2030. That's a 50% increased retirement tax burden.