They all offer different units, supports, and improvements. While the Aztecs have a home city, the Iroquois and Sioux have five members of the Tribal Council: the Chief, the War Leader, the Shaman, the Wise Woman, and the Messenger. Instead, there are a number of new concepts introduced, whilst existing concepts have been expanded. There are no major changes to the mechanics to Age of Empires III - players are still expected to gather resources, build armies and send them to attack opponents.
