British English present participle: the ongoing process of organizing or converting something into a federal system.
British spelling of federalizing, using the present participle -ing suffix added to federalise, the British variant of federalize.
Right now, many countries around the world are federalising—decentralizing power to regions while maintaining unity—which shows that federalism is still a popular answer to the ancient problem of 'how do you govern diverse people together?'
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