People like Peter Zeihan argue that the USA seems like it will have a large replacement population just because they had a large population to begin with (boome

People like Peter Zeihan argue that the USA seems like it will have a large replacement population just because they had a large population to begin with (boomers -> Millenials -> Gen Alpha). There are things that can blunt this (Millenials can't afford to have kids) but so far it seems like it is holding fairly steady. Given this it would be difficult to argue for them getting stuck in some specific technological era.