by Jim Rose in economic history, population economics

New Zealand and the USA were much more serious about the post-war baby boom than were the British or Germans. The German fertility rates drop below replacement rates in the late 1960s with the British and Americans following them in in the 1970s. Only New Zealand still has a fertility rate of above replacement or thereabouts. German fertility has struggled to stay above replacement rates for coming on 100 years.

Source: Fertility Rates — Our World in Data