I've been rereading Lost Empires of Faerun while coing campaign planning, and I idly started reading the section on the Crown Wars and got drawn into it. To me at least it's a fascinating history and a fascinating vision of the development of the elves politically and socially. The idea of powerful elf kingdoms like Aryvandaar, Illefarn, Shantel Othreier, and so on, and later on Cormanthyr, really appeals to me, and yet you don't really see this kind of thing in campaign settings too often. In the Faerun setting, the elven realms as such have all but disappeared by what is canonically considered "the present day." The same seems to be true for other campaign settings; Greyhawk is by all accounts a very humanocentric world, with elves (and for that matter all the non-human humanoids) being comparatively uncommon if not rare. I have no idea how Dragonlance manages this, although Eberron seems to have given the elves a fair deal of play, from what I've heard of it.
Can anyone tell me if they have set their games in a world (whether FR, Greyhawk, homebrew, or something else completely) where the elves were still relatively powerful, and had their own countries and how it worked out? For those of you who have done homebrews, how have you managed this kind of question? Are elves wanderers without countries, rulers of realms, or both?