When the third Earl Grey attempted, between 1846 and 1851, to promote federations in Australasia, South Africa, and British North America, he found scant support either at home or in the colonies concerned. He failed (except, in a sense, in New Zealand) partly because his schemes were more visionary than practically suited to existing colonial conditions, and partly because measures “imposed by the imperial authority” were apt to encounter difficulties abroad and, therefore, political trouble at home. Following Grey's departure from the Colonial Office, imperial policy makers refrained from prescribing federal systems for the settlement colonies. His abortive plans, however, had consequences during the next twenty years which, though different from Grey's intentions, amply vindicated the ability of the imperial government to exert its authority, and established, in the end, the desirability of colonial federations. For a decade and a half after 1850, the home government repeatedly and successfully frustrated local proposals for federation in the three continental groups of colonies. Then, between 1864 and 1870, it hurried to completion the union of British North America, and set about promoting that of South Africa. At the same time, it refrained from pressing any such development upon Australia, and actually arranged the dismantling of New Zealand's federal/provincial system.
No inconsistency was involved. Britain's policy towards all these colonies was designed in favor of its own interests, tempered by a remarkable consideration of those of the colonies. The chief imperial object during the period in question (c. 1850-1870) was to reduce the country's military and political commitments; and the chosen device for the purpose was encouragement of colonial self-government, in various forms, including republican independence in the Boer states of South Africa.