I really enjoy this game.  There are seven fractions that all broke up when they landed on the planet.  You must choose to represent one.  There are several changes that this game made along with improvement, A.) There  is now a concel that all the countries make up.  When issues arive they all  go to meet on the issue.  You can run for planetary governew where you are  essianly the leader of union.  I really enjoy this and it opens up the  option for a diplomatic victory.  B.) You now have boarders.  This is  simple where your city limits are.  An improvement for a possible AC2 would  be that you can move the boarders by notation and not but building a city.