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An era is a period of time in Civilization IV and its expansions. Civilizations can progress to a new era by researching new technologies.

The eras in the game are as follows:

Civilization IV [edit]
WarlordsBeyond the SwordColonization

Buildings (Unique) • CivicsCivilizationsErasLeaders (Traits) • ReligionsResourcesSoundtrackTechnologiesTerrains (Tile Improvement) • Units (UniqueClassPromotions) • Wonders

Hammer (Civ4) ProductionBeaker (Civ4) ScienceCulture (Civ4) CultureBread (Civ4)FoodEspionage (Civ4) EspionagePower (Civ4) PowerHealth (Civ4) Health

† Total conversion remake of the game Sid Meier's Colonization using Civilization IV engine
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