But to be cheeky, trek lit "exactly" being the same "exactly" as used in The Good that Men Do?
Personally, that's a line I don't think should have been crossed. It's a moot point, that novel is six years old and the storyline it began has been concluded. And yes, I get it, TATV was only a holodeck intrepretation of events, but as far as I'm concerned it's an episode and whatever is depicted within is of equal canonical value as The City on the Edge of Forever or The Best of Both Worlds or whatever is named the best of the various series. I don't deny TATV is a bad episode and terrible finale, but I was disappointed when even Pocket Books stooped to the level of common fanboys and decided to change the episode to suit their whims.

(Prior to learning that, my guess was Romulus; I was indeed hoping this was the 2387 story).
The line of succession was effectively broken and surviving authorities banded together to reform the US government. The same as in Shattered Union.