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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

BuildingsCivicsCivilizationsErasPromotionsResourcesSoundtrackTechnologiesTerrainsUnitsWonders

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