How did the Australian accent come about?

Can anybody tell me how the Australian accent came about?

It seems strange to me that it is not more like an English accent taking into account that the first and the majority of settlers were English.

Also, I am under the impression that those settlers were not really influenced linguistically by the native Aboriginal people much.

Please correct me if I am wrong.

Just so you know, modern British English doesn't sound much like English would have sounded like when Australia or the US/Canada was colonized. In fact, many Southeastern US accents are closer to British English from the 16-1700s than British English is today. The accent from Tangier Island, Virginia (video) is about as close to British English from the old times as you can get.

Several things did quite a number on British English, aside from the natural progression of accents over time, such as the advent of Received Pronunciation and its filtering into the general accents.

A few accurate statements above, ie Australian is a blend of accents from all parts of the British Isle although admittedly it has a more east London sounding twang than anywhere else in Britain, but let me expand on that. Firstly there is no such thing as a British accent per say. The accent in the north east of England is as different from say Oxford in southern England as it is from Melbourne in Victoria and always was. Secondly, as someone already mentioned on this thread, accents in the British isle have changed tremendously since the days when Australasia and North America were first colonised, in fact British English has changed far more than American English over the last 200 years.

Australian developed the way it did, due to settled regions throughout the continent having roughly the same percentage of British & Irish immigrants from all parts of the UK per head of population. In America that was not the case, certain areas of America had more immigrants from particular parts of Britain and Ireland, plus unlike Australia, many early settlers also came from mainland Europe.

Ironically today in England, the new Estuary English accent which is expanding north and west from London amongst people who are predominantly under the age of around 40, is verging closer to the way modern Australians speak, in-particular the way they use a higher pitch at the end of a sentence, this speech pattern is also becoming popular in California.

The Australian accent is a blend of the accents of the first white settlers who came from all over the UK (with a bit of attitude thrown in).

See the Where did the Australian Accent Come from? documentary on YouTube for a further explanation.

Australian English is the standard language spoken in Australia. Its accents differ from various locations in all states and territories and show a regional and social diversity.

This is no different from accents in US, England etc.

Many immigrants established themselves in various locations, influencing the accent of the English spoken.

As someone who was born in Tasmania, but spent much of his childhood in Norfolk, I've always been amazed by how little is mentioned about the uncanny relationship between the two accents. Take a good old Norfolk boy, put him in harsh sunlight so he has to squint his eyes, and surround him with flies so he has to keep his mouth pretty much closed, and you've got a pure Aussie voice. A looong toooime speeent on the vowels, a rising inflection, it's all there. This Norfolk/Suffolk accent would have been prevalent across the whole south east, before it was shoved out by cockney, so would have been the base of the flash argot of London, exported to Botany Bay and Tasmania.