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Nationalism is a technology and civic in the Civilization games and an advance in the Call to Power games.

Civilization III

Civilization IV

Civilization V

Civilization VI

Civilization: Call to Power

Call to Power II

Other games

Nationalism is not present in (or the article has not been created for) the following games :

Game Article
Civilization VII Nationalism (Civ7)
Civilization: Beyond Earth Nationalism (CivBE)
Civilization Revolution Nationalism (CivRev)
Civilization Revolution 2 Nationalism (CivRev2)
CivWorld Nationalism (CivWorld)
Freeciv Nationalism (Freeciv)
C-evo Nationalism (C-evo)
Sid Meier's Alpha Centauri‎ Nationalism (SMAC)
Starships Nationalism (Starships)

Not in the following games

It has been confirmed that Nationalism is not present in the following games :

Civilization II
Sid Meier's Colonization
Civilization IV: Colonization

Future technology (CivRev)
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