History
As human beings spread out into isolated communities, stresses and peculiarities develop. Over time these can develop into identifiable accents. In North America, the interaction of people from many ethnic backgrounds contributed to the formation of the different varieties of North American accents. It is difficult to measure or predict how long it takes an accent to formulate. Accents in the USA, Canada and Australia, for example, developed from the combinations of different accents and languages in various societies, and the effect of this on the various pronunciations of the British settlers.
In many cases, the accents of non-English settlers from the British Isles affected the accents of the different colonies quite differently. Irish, Scottish and Welsh immigrants had accents which greatly affected the vowel pronunciation of certain areas of Australia and Canada.
Read more about this topic: Accent (linguistics)
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