Victoria: Revolutions is the expansion pack for Victoria: An Empire Under the Sun.New features- 15 extra years of game play, extending Victoria into the interbellum.- An expanded tech tree to cover the interwar period, including aircraft and carriers.- A Doomsday converter which allows players to continue their game in Hearts of Iron II: Doomsday.- A revamped election and politics system, adding a new level of realism to the game.- A new ideology, fascism- An overhauled military system, which will be linked with the player’s policy decisions.- A new economic system that brings more realism through various economic models.