I am afraid that sounds a bit off to me, you see, wherever you go throughout the old Empire, people of British descent sound different. Now, you cannot tell me that the English aristocracy decided to change the way it spoke everytime there was a large influx of Brits to the colonies?
Now, there was study, a very good one, done recently about the European NZ accent, it has now been proved that it is slowly changing and moving away from what it originally was. This would indicate that in fact, all those departed from their ancestral homeland, have also gone through the same process.
If you here a recording of a kiwi from the end of the 19th cen. they sound like either Scots, English or Irish. They clearly no longer do, thus I would, by simple application of logic, have to refuse to accept such a hypothesis, to boot that book is now over twenty years old and its research is probably a bit long in the tooth.
There are also, so many ancient regional accents in Britain that it is impossible to state that the English accent has lossed its historical roots through an aristocratice revolution of pronounciation, it simply cannot be true that the farmers I met in Cornwall are the end effect of such a thing. I can hardly understand them, same goes for the boys up north. These accents and dialects are ancient and reach well beyond the founding of the U.S.A.
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