Larger Pan-Continental Dominions?

What would it take for Britain to set up larger, pan-continental dominions in its colonies?

I'm thinking a Dominion of America including all of Canada, Bermuda, Newfoundland, and possibly even the British Caribbean and Belize.

A Dominion of Australasia including Australia, New Zealand, Fiji and the British Pacific (that one was actually considered during the 1890ies, and is still enshrined in the Australian constitution.), Papua New Guinea, and maybe even Malaya.

A Dominion of India including Pakistan, India, Burma, Malaysia and Singapore.

A Dominion of South Africa including the Cape, the Boers, and both Rhodesias.

Is it possible for Britain to set up these four dominions? I've never understood why Newfoundland stayed independent of Canada till the forties, or why the British didn't fold the Caribbean into Canada - it was just as threatened post civil-war by an American invasion as Canada was.
 
South Africa is probably the easiest.

On Australasia, I doubt New Zealand will join, there's too much distance and hell Western Australia was a struggle to get to join in. However, avoid someone like Woodrow Wilson organise the *League and I can easily see Britain 'rewarding' Australia with captured German colonies, partly as prize to show they've grown up and partly to avoid the cost of garrisoning various far flung islands.
 
Canada could buy the mentioned territories, hell if the american revolution failed or wasn't provoked to begin with you could see a nearly entirely pan-continental union (other than New Spain, which would likely not break into a war with territory close to the heart of the British empire).
 
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