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pillarisation

n. (alternative form of pillarization English)

Wikipedia
Pillarisation

Pillarisation ( Dutch: verzuiling) is the politico-denominational segregation of a society. These societies were (and in some areas, still are) "vertically" divided into several segments or "pillars" (zuilen, singular zuil) according to different religions or ideologies. The best-known examples of this are the Dutch and Belgian ones.

These pillars all have their own social institutions: their own newspapers, broadcasting organisations, political parties, trade unions and farmers' associations, banks, schools, hospitals, universities, Scouting organisations and sports clubs. Some companies even hire only personnel of a specific religion or ideology. This leads to a situation where many people have no personal contact with people from another pillar.

Austrian, Iraqi Arab, Israeli, Lebanese, Maltese, Nigerian, Northern Ireland, and Scottish, societies are or were examples of this phenomenon.