The transformation of Canada was dictated by the irreplacable genetic losses it suffered from 1914-1945. Canada’ loss of its best men during over ten years of savage war reflected a high percentage of its most productive citizens. A higher percentage and more devastating considering its smaller population. Immigration from the third world further altered the cultural fabric. Much of the same has happened in Britain. America is dealing with “allies” and neighbors that are not recognizable. So is their politics.
The same with the “lost generations” in Germany, France, Netherlands, and Italy. Ennui, fatalism, nihilism, hedonism set in. Below replacement birth rates. Loss of belief in God and a better tomorrow. No reason to make progeny.