Rising ethno-nationalism in recent years has many mothers. Migration, increasingly multicultural societies, economic dislocation and inequality in a globalized economy have all contributed to a role in a growing sense of alienation among populations whose demographic, economic, and cultural hegemony is in decline. But one factor rather less remarked upon is the population bust.
Among white Americans, fertility rates have fallen to 1.75, well below the replacement rate (around 2.1). Among native-born residents of the United Kingdom the rate is 1.76. In France, Austria, and other sites of prominent nativist ethno-nationalist movements, fertility rates have been well below replacement for decades.