Comment by slibhb

I think the answer is boarding school:

> Most students at both preparatory and public schools were boarders, meaning that elite Victorians were generally sent away from home by the age of eight and spent their childhoods more with peers than with family. In this respect they were distinctive even in their own time: elite families in continental Europe and the United States were far more likely to keep their children at home and educate them at small local private schools. It is plausible that this contributed to the lack of subnational loyalties in the British elite, in contrast to the distinct elites of, for example, the Southern United States, Catalonia in Spain, or Hungary in the Austrian Empire

Less developed, more dysfunctional countries tend to have closer family ties. More developed countries tend to have looser family ties. Sending children to boarding school starting at age 8 is a good way to diminish family ties.