[quote=@The Nexerus]
I included only Newfoundland as being under British sovereignty because a nation in the Interest Check (that seems to have bowed out) divided up Canada into various nations, but didn't state anything definitive about Newfoundland. If it is at all possible, I think it would be reasonable for London to have reacquired sovereignty over Canada in the same way that it reacquired sovereignty over Australia and New Zealand. Simply replace China with the United States. It likely would have occurred even sooner than Australia, actually.
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You could also reacquired sovereignty over South Africa...