Oh, there are WAY more than two accents in America. : )
I spent my teen years in Texas, and I could identify at least four distinct regional accents in just that state! I once went on a trip to the deep south, Appalachia, and ran into people who I thought were speaking Elizabethan English - which wasn't all that far off as they'd come in from a very, very, VERY rural area that had been settled back at the beginning and had not had a lot of intermingling with "outsiders." New Jersey has three very distinct accents that I can recognize. New York City used to have several, although I haven't been there in years and so can't say if it's remained that way. Cable TV has damaged the "purity" of a lot of the more rural/regional accents, bringing in outside influences.
We took a trip to England last year, and had a layover at an airport in Minnesota on the way. The local accent there was staggering - in California there is a series of TV commercials put on by the dairy board, and they feature "happy cows" with a very intense Minnesota accent. Every time someone at the airport opened their mouth all I could think of was "happy cow!" though, thankfully, I didn't burst out laughing.
Then there's all the New England ones - Maine, Bahston, etc. And here in California there's Northern California, Valley, Southern California (with various sub-varieties), and "LA" - which is kind of effeminate - that I have heard (so far). This doesn't include the ethnic-influenced ones. (California has a LOT of immigrants from other countries.)
I get some enjoyment out of listening to overseas broadcasters (DW, Radio Moscow, etc.) who are speaking in "standard" American and trying to see if I can identify if they are native speakers or not. Hearing someone speak "American Standard" is pretty much a tip-off that they are very likely NOT a native of the USA, as - aside from a small pocket in the upper mid-west, towards the east a bit, if it's still there - I don't think anyone has actually spoken American Standard English in years. If they don't throw in the correct idioms and slang terms, it's a clincher that they are foreign, although very well-schooled. (Though I could be wrong.)
When I was in London we had a great time with the accents. It seemed that everyone we met in the underground (who worked there) or a bus station sounded like Stan Shunpike from Harry Potter. (The night bus? The one we were on drove just like the one from Harry Potter, and "Ern" could have been modeled on the driver!). In the shops, depending on where we were, we heard many different accents. We took a car trip up to the north west, and when we checked into our Inn I had to have my daughter decipher what the clerk told us - he spoke with such a thick accent and spoke so quickly that between each of us understanding about half of what he said we were able to put the whole thing together.
We're taking a trip soon that will have us in Scotland and Ireland (both of them) for a bit. I'm wondering how that will go, auditorially. : )
But in the meantime, from SoCal beach community, for your original request -
"Duuuuude, way, bro!"