Depending upon its technology, a civilization can be in any one of four game eras. All civs begin in the Ancient era.
Eras
Ancient: A civ must know 5 techs to advance out of this era.
Medieval: A civ must know 14 techs to advance out of this era.
Industrial: A civ must know 24 techs to advance out of this era.
Modern: The last era.
Era Bonuses
Each civ has a special game bonus that kicks in once a civ achieves the associated era. Bonuses are cumulative: for instance a civ in the Industrial era gets the bonuses for the Ancient, Medieval, and Industrial eras. See "Civilizations - Era Bonuses" on page 59 for a list of each civ's era bonuses.
 
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