At the ignorant person to post American's can all be shot on sight. All I have to say to that is simply: Grow Up.
Someone mentioned that America is infatuated with what we can't have and I can attest that this is very true I wrote a 12 page paper about just this in my last English class.
God I hope it's not the southern they think of, that just makes us all look like a bunch of red neck hillbillies
Anyway I have a friend who is from the UK and he says he tried for like a day to copy our "accents" but got bored.
I'm from South Dakota, but I'm not sure what our type of accent is. I think we sound the same as most Americans... I can only tell between my accent and the typical southern accent.