It's interesting that for something considered "too American" at times, the United States apparently no longer exists in Trek. Oh, the cities and states still do, but the United States government is generally referred to in the past tense in the various Trek shows.
It kind of makes me wonder if the U.S. collapsed at some point after World War III and it was replaced by something else--perhaps "North American Alliance" or something like that, I dunno...
It's somewhat implied that the East Coast no longer exists. I don't recall any reference to New York, Washington, Baltimore, Charleston, Columbia, Boston, Richmond. The easternmost geographical reference from pre-ENT Trek that I can think of is New Orleans.
ENT of course does have a geographical reference to the East Coast--Florida. Of course, it was shown just to be destroyed.
I like to think everything east of the Mississippi is a nature preserve/memorial, and possibly still slightly radioactive, with no human inhabitants any longer.