Canada, Australia and New zealand stay with Britain

United Kingdom of [1] England, [2] Wales, [3] Scotland, [4] Ireland, [5] Nova Scotia, [6] Prince Edward Island, [7] New Brunswick, [8] Newfoundland-and-Labrador, [9] Quebec, [10] Ontario, [11] Manitoba, [12] Saskatchewan, [13] Alberta, [14] British Columbia, [15] Queensland, [16] New South Wales, [17] Victoria, [18] Tasmania, [19] Southern Australia, [20] Western Australia & [21] New Zealand

Unitary state like OTL nowadays UK but with 21 , not just 4 "home nations".
Each home nation has its devolved regional power structures, but only as delegation of the Westminster Parliament power.
 
The New Zealanders and Australians were more than willing to play ball, at least according to a book I am currently reading, while the Irish, Afrikaners, and Scottish-led Canada were not unless it came to getting economic aid, preferential treatment in relation to tariffs, and having the British pay for their military protection.
 
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