hey, i'm obbsessed with Civ also - and the exp. packs Play the World + Conquests
- there's the official site, check the forum etc...
it's an amazing game, various historical events happen and you can choose whether to follow them in the way with which they happenned in real life, or there is a fictional option e.g
during the American Civil war, the Trent affair, if you were playing as Britain you could choose to intervene on the side of the Confederates, which is very interesting,
or you could play as Spain and recapture the whole south American continent e.g war with Brazil, uruguay, chile etc... lol
but yeh - you could play as Tibet and declare independance from China and take them over...but that's only if your an amazing player lol
its like civ - but the system is much more advanced - a very complex economic system, free-trade/protectionism etc...and you can choose the freedoms allowed in your country etc.... whether to allow full sufferage or only voting according to wealth, and you can ban certain parties, but could cause a civil war lol
and there are different systems eg. you can be completley totaliterian as Japan for example, but then the people revolt and you have a revolution and become a republic/ communist state etc..