Mark Steyn’s book, “America Alone” goes into great detail on populations statistics. The data are appalling. All of Europe is below 1.5 as is Asia as well. I believe Japan’s level is 1.3 which Steyn calls “cultural suicide.”
Frank
This author, “Spengler,” has a book out under his real name, Goldman, iirc, that sees the Moslem world headed down the same road, only faster.