According to British people we either have redneck, valley girl, or ghetto.
https://www.youtube.com/watch?v=FRar12QZOsQ

The people in this video are all horrible. Apparently, one of the reasons why British people tend to go for the southern accent is because it is easier for them to do.

I have also hard that we are known for the hard "R'" (although there are some variations of the New England dialect that use the soft "R") and can sound nasily.

I hear that because Brits have a hard time hitting the hard "R's", if you want to fuck with British people ask them to say the word "Mirror" with an American accent.

I'm going to go off topic for a moment, if there is no British accent that what the hell are we supposed to call the collective family of dialects that exist within the realm of the United Kingdom of Great Britain and Northern Ireland? Just as is there is no one American accent (try to tell a Dixie they sound like a Yank) but to call them all American is fair game. Then again I hear that British people take accents more seriously, plus foreigners do tend to jump to posh or cockney when they think of British accent. I'm not trying to be offensive but what are we supposed to collectively call them?

"Least amount of accent", not so sure, more like "the accent we're most used to" (making everything else "non-normal", for lack of a better word).

This is more or less what I consider the "classic" American accent. https://www.youtube.com/watch?v=LpJ3yzUPbL0&feature=youtu.be&t=68

Like others have said, it has a bit of a nasal inflection and the "r" sounds almost like "wr". No idea of which accent it is, but it's the one I hear the most. Lol. Might as well went with Friedman and Luttwak. At least they're true Americans.

I could be wrong, but my understanding is that the "classic American accent" people usually think of is basically an early 20th century northern Ohio accent. What happened was that when radio was taking off, they needed to find an accent that everyone would find easy to understand and they ended up settling on that one.

Yes, just as there is also more than one French and German accent but if you've watched Black Adder then I need say no more.

The mockery accent generally used by non Brits to portray silly Brits is the ole "I say ol' boy." With that I bid you "Pip, pip and Cheerio!"

Not sure about that. I live in that part of the world where almost everything gets translated in the local language, so my ears are really not trained enough to grasp the difference between all the American (or British for that matter) English accents.

American accent to me is something similar to how Bush Jr. speaks (the reporter too has a similar accent). Or, as another example, Neil Armstrong and Bill Clinton in this other video.

I'm guessing these are mostly east coast accents?

Sorry, Bush jr. is a southern Idiot, unable to speak even the faintest proper English or American. (southern not meant as an insult for the rest of the people living there ;) )

Even some Americans suggested to have subtitle for his speeches as even they didn't understood what he was/is babbling ;)

Just thinking of his neewclar speech. (soory can't write it better wrong....)

Bill Clinton is from Arkansas so he also has a bit of a southern accent, although not quite as thick as Bush Jr.'s Texan accent. To put things in perspective here is a region map.
http://www.mapsofworld.com/usa/usa-maps/united-states-regional-maps.html

Business insider did an article on regional accents, well more specifically they show some maps and then make snarky comments on the results.
http://www.businessinsider.com/22-maps-that-show-the-deepest-linguistic-conflicts-in-america-2013-6

They are dead wrong:

Picture 18: What is your general term for a big road that you can drive fast on: Autobahn!!!!!!!!!!!!!