No worries, was typing on my phone for that one, so it was shorter and probably more terse sounding than I meant it to be. (the question post)
It's actually not unfounded, though...the 'general american' accent is considered technically the least 'accented' accent...if you will. Other than a few small things, it's pretty true to the way english should be spoken. The practice of dropping 'r's in the english accent and boston/new york accents (pahk the cah in the yahd) was a creation of the english elites around the time of the american revolution, as a means of separating themselves from the rest of the lower classes (thus making them dooshers).
A quick search revealed this article on it, although I'm sure there's more out there, but I wasn't going to waste too much time on it:
http://www.livescience.com/33652-americans-brits-accents.html