Civilizations are a gameplay mechanic in Age of Civilizations 2. Civilizations are able to manage their own Population, Economy and Technology levels. Civilizations are either controlled by artificial intelligence or a player. When one picks a scenario, they will be able to see all the civilizations in that scenario by scrolling and moving the field of view. They will also be able to see the total Population level, the Economy (Industry) total, the average Happiness level, the capital and what percentage of other civilisations' nationalities are in their population.
Not every scenario includes all of these types of governments, an example is the Modern Day scenario, which only contains 123 democracies, 60 republics, 17 monarchies, and 4 communists.