There have been a number of changes to the Civ IV game with this stand-alone expansion. First of all is the player interface, both in terms of management screens and in regards to the world UI. In addition to the four colonies, there are two leaders per colony, each with different ways of affecting the path to the revolution. As colonies grow, players will fill a liberty bar. Once the bar gets to 50%, the revolution can be launched. But there is a lot to do before that can happen.