Hegemony
In the 19th century, hegemony came to denote the "Social or cultural predominance or ascendancy; predominance by one group within a society or milieu". Later, it could be used to mean "a group or regime which exerts undue influence within a society". Also, it could be used for the geopolitical and the cultural predominance of one country over others, from which was derived "hegemonism", as in the idea that the Great Powers meant to establish European hegemony over Asia and Africa.
Haegemonia: Legions of Iron
Haegemonia allows the player to create a multi-system empire. At first, only the planets similar to Earth can be colonized. After advanced terraforming and colonization techniques are researched or stolen from enemies, almost any planet can be colonized and, eventually, terraformed into Gaia-class worlds (gas giants are uninhabitable).