バルカン化という言葉があるんだね。Balkanization :
Balkanization is the process of fragmenting a large region, state, or organization into smaller, often hostile, and ethnically homogeneous units.
@georgebest1969 "Unjust or prejudicial treatment of a person or group, esp. on the grounds of race, gender, sexual orientation, etc.; frequently with against. Also (with in favour of): favourable treatment of a person or group, in order to compensate for disadvantage or lack of privilege."
ODEによれば、1819からもともと米国から使われ始めたということのようだ。"Unjust or prejudicial treatment of a person or group, esp. on the grounds of race, gender, sexual orientation, etc.; frequently with against. Also (with in favour of): ...