Zones of control
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Stardock Forums
One thing I miss from games like Civilization is the idea of a zone of control that extends from an empire's holdings. Within this zone, enemy ships could be considered free game or at least present additional diplomatic options to request their removal from occupied territory. I miss this in GC and think it would add another level to the game that is already very very good. Even the old days of Star Trek had the neutral zone you did NOT want to cross that line