Why would it be banned in the US?
There's no graphic nudity (which would result in an 18+ rating). Violence doesn't seem to be much of an issue for the US ratings system; the combat system probably would make the game 16+ or 18 though, I guess (ratings boards don't seem to appreciate detached body parts.)
Swearing does affect the ratings (so unless Toady cleans up the random name generator the game would be 16+ I guess). I hope Toady does not clean it up
So does mentioning alcohol, drugs, tobacco etc. Since DF has alcohol in it, the rating would probably be 12+ (wait, the characters actually have to consume it - 16+ maybe).
[For the game Hitman 1, the swedish team had created realistic strip bar dancers. Then they submitted the game for age certification and were told to add bras. They added horrid dirty-white grandmother-style DD-cup bras to their stippers, and the game (which is about sneaking up to people and killing them) got a 12+ rating. Without bras, it would've been 18+. Strange, huh?]
[One game I worked on would've got 16+ ... the ratings people said we had to remove the word "shitstorm" from the dialogue in order to get 12+. So now instead of a "huge shitstorm coming up", we use "a huge problem coming up" and got 12+ (and a language warning)... )
[ May 05, 2008: Message edited by: Trollvottel ]