City State is the first File:Civic.png Civic Research available at the Library. It is required to research the second Civic technology, Empire. In addition to increasing the city limit by + 1 and expanding National Borders (as with other civic research), researching City State unlocks the Taxation research at the Temple and the Allegiance research at the Tower. The default cost is 120 File:Food.jpg Food, the default research time is 13.3 seconds (200 frames).