American accent last? No surprise there...
...although the "American" accent can differ widely depending on the region.
You've got your New York City -- upwards of half a dozen different accents in NYC alone, depending on where you are: Queens, Brooklyn, Bensonhurst, Jewish/Manhattan... I'm oddly attracted to girls with a Brooklyn accent, for some reason.
Just a bit south, you've got your nasal, "hard" North Jersey, or "Joisey" -- you could be a PhD. from Princeton, but if you're from North Joisey, you'll always sound like a dumbass. Think Marissa Tomei in "My Cousin Vinny".
Then, there's your South Jersey/Philadelphia -- kind of like North Joisey, but not quite as "hard". My wife is originally from South Jersey; it took her years to get rid of her accent, but when we head up to Cherry Hill to visit her family at Christmas, she instinctively lapses back into it.
Then, you've got your Boston -- again, several types: your classic Bahhstn, as in "pahk the caah in Haahhvahd Yahhd," your South Boston, and your Brookline (think JFK).
Then, there's your Southern, of course -- but once again, this depends on whether you're in Virginia (fairly mild), the Carolinas, Georgia, and worst of all, the Deep South: Mississippi, Alabama, thereabouts.
You've got your sort of corn-fed twang in the Midwest, kind of twangy, but not as strong as Southern.
Then, of course, Texas: enough said.
And, moving west, you get your Classic Californian accent which, to the untrained ear, sounds like someone who's been smoking a lot of weed, especially around San Francisco.
Myself, I'm from Washington, DC, mid-Atlantic East Coast, and have what I like to call a "Six O'Clock News" accent -- that is, plain, homogenized, no distinctive inflections, like a TV news anchorman, a sort of American counterpart to the British "BBC English" accent.
Pint of ale icon because, as I mentioned, I'm a total sucker for a girl with a British accent.