Where did the american accent come from? Why don't they speak like the British. Aren't they literally Brits who wanted independence? Why did they suddenly started talking differently?
It's an amalgamation of all the European people who immigrated here
That said, there's still numerous regional accents. I'm glad we don't have those chav accents though; they are horrid on the ears.
It depends on the region. In the Northeast its just an evolution of the English accent of the time but unlike in Britian it didn't go (Mostly) non-rhotic. I don't know how the south happened. In the Midwest its a mix of the already established Northern accent and then some immigrant accents. In the West its a mix of all of the accents.
Before some fuckhead brits get butthurt, when i say its a natural evolution of the English accent at the time, I do not mean its close to Elizibethan English.
The typical 'southern' accent is kind of like ebonics in that it developed in a closed system. This system was formed due to the large distance between communities formed by an agrarian lifestyle with the significant land provided by expansion. Similar to ebonics, it's come to a point where the bastardizations of english that were slang at the time are now part of the common vernacular.
The American accent comes from the original accent the colonists had. Our accent has changed very little over 200+ years, however, the British accent has changed quite a bit. So now there is a large variance, unless you talk to someone from parts of london, sometimes I can't tell if they are from the new england area or just a really like english accent.
This isn't too far off. Obviously both have changed a lot but British regional accents are more or less as they've always been, but RP is a recent invention. Compare British and American newscasters from the 20s to 40s. Very similar.
There's a few regions in the UK, and Ireland, that have an accent that sounds much more like the American accent, so probably, the accent evolved from those regions?
I'm not sure what you mean OP, accents diverge over time, and we've been separated by an ocean for at least 300 years
It's actually pretty amazing how similar the accents are still
The American accent, particularly the Southern accent was inherited from the way Brits spoke at the time. Right down to American/Southern colloquialisms like "Fixing to ~" etc. Standard British English has evolved a lot more than American has.
The Australian accent strongly resembles the cockney accent, only it's less clipped and annunciated, and more drawled. Apparently the first generation of Australians born here developed the accent and it hasn't changed much since.