British English: having been organized or converted into a federal system with power distributed between a central authority and regional governments.
Past tense and past participle of federalise, the British English verb meaning to organize federally, with -ised as the British past tense suffix.
When a country becomes federalised, it's often the result of major political struggle—regions fighting to keep local power while still being part of a larger nation, which is why federal systems usually form after compromises, not calmly.
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