The candidates offer higher bonuses at later ages. The tribal council is present in the game when a native civilization advances in age (replacing the politician system of the European civilizations) the player can select to promote a candidate to the Tribal Council and this confers a bonus on the player. 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. It was followed by a second expansion pack to the original game called Age of Empires III: The Asian Dynasties.

The full game for Mac was released on Jin the United States. The Mac version was ported over, developed and published by Destineer's MacSoft. The expansion pack was bundled with the full game of Age of Empires III, called Age of Empires III Gold Edition on October 23, 2007.

It was released on Octoin the United States. Age of Empires III: The WarChiefs is the first expansion pack for the real-time strategy game Age of Empires III.