I discovered, in attempting another mega-giant poll, that polls will support 255 answers, no more. . . .so it is possible to actually create a "pick your nation" poll. . . .of course, keying it in would well and truely suck, trust me.
It's possible 255 might not make it, and require titles like "French Micronesia". . .there are dependancies, protectorates and colonial remnants that are quazi independant enough to rate their own citizenship which would probably create hundreds more "nations" than one might expect. (And saying you're "French" if you live on a tiny island 300 miles from australia would be less than clear.)
And no, I'm not in Antarctica. . . .that said though, I would not be surprised to find gamers there. . .not exactly lots of nightlife, and most of the folks down there are scientists and grad students, right in our demographic.