"The French revolution had a massive impact on politics, hell we still use terminology from the political fallout from it. You have probably heard of the term right and left wing policies, well that came from attempts to form a government during the revolution. The more extreme group sat on the left side of the chamber and the more conservative politicians and militants sat on the right.
Also in Ass Creed III, if the assassins stand for freedom and public autonomy why where they supporting the Freemasons? Masons have their fingers in all levels of public office, economics and industry. Sure they may not be taking over the world but you can bet they have reach arounds and support each others interests. Thats a hidden form of control." - J Tyran
First off, the definition or origin of the term has no bearing on modern understanding. Secondly, bugger off with the conspiracy nonsense.
On the topic of Ass Creed, I enjoyed the second game the most because I was in Italy. The architecture was fun to climb on while being very photogenic (for a Canadian who's never been at least). I enjoyed it because it allowed me to escape to a time that was grand, opulent, and fun to explore (or perhaps fuck up). With the American Revolution, all there is are forests and wooden huts. There is no elaborate architecture and no real evil force. At least if they went with the Civil War, there would be clear assholes.
EDIT
Also, with the ancient architecture, there comes the implication of interesting events that have occurred there, especially in very interesting buildings. I had fun with AC2 (and admittedly Uncharted series) because I was imagining being there and investigating my surroundings. Perhaps it's the inner archaeologist, but I find myself enjoying a movie or game better when it's in either a location with a lot of history or a lost civilization.