JB--
Heh, although I started on a really small forrested island (barely enough for 6 cities,) I managed to settle on the nearby large continent, take out a small Chinese civilization, a medium-sized Babylonian one, and a terrifyingly large Sumerian one. So, really, I have a pretty big empire. The problem is that I don't have enough military forces to cover everything (the classic maritime empire problem,) and so had to get a "coalition of the willing" against the Sumerians (and that war HAD to be fought, b/c they were in danger of winning a cultural victory). Problem is, they're destroyed, the war's over, and I've taken a bit of a reputation hit because of all those Sumerian cities that I burned down.
(Hypocrites. They were doing likewise.)
I built the UN and held a vote, but it was inconclusive -- I got 4 votes, France got 5, and one abstention.
Anyway, as I was busy building spaceship parts and the Cure for Cancer (an absolute necessity -- despite building Universal Suffrage, the citizens of my Dutch Republic are unhappy due to war weariness and draft resistance,) the Ottomans and Americans (hitherto allies against Sumeria,) signed an alliance against me and declared war. In the meantime, my home island was denuded of troops (they were flown over to the continent) and there's an invasion fleet approaching. I could probably scrape up enough troops/airpower to wipe them out thanks to cash and more drafting, but I'd rather just wipe 'em out with that tactical nuke I have in store for just such an occasion.
Also: The Americans and Ottomans aren't real threats -- the Persians are the ones I'm racing to Alpha Centauri. So I don't even want to FIGHT them (except maybe to grab a luxury colony from America). I'd post a screenshot, but I'm at work now.
The upshot of it is: I don't want to get hit with a dogpile right now. While I probably could win, it would be highly distracting, and I just might really NEED to nuke Persia to stop them from launching in the near future. Plus, France would probably join in against me if push came to shove, and they have nukes too....