In addition to nation-level trade and diplomatic concerns, you are tasked with managing region and city-level projects, choosing the right technologies to research, directing military movement and development, conducting international diplomacy, maintaining domestic stability and producing resources vital to making everything else possible. Developing production and research facilities in cities transforms them into centers of industry and technology. Upgraded cities can produce new units and unlock advanced technologies. At the region level, you can build large-scale defensive structures such as radar arrays and fortifications, develop transportation infrastructure, and expand the resource production needed to fuel your economy. Victory on the world stage will require that all levels of your empire work together towards your goals.
Every turn offers countless decisions and options to move forward, writing the history of your empire. Will you block trade routes with your navy, choking off enemy supplies? Will you grant a restless ethnic or religious group independence to prevent widespread revolt? Will you build up your trade agreements and expand your influence with industrial might, or invest in an expensive, technologically advanced army to crush all opposition? In addition to keeping domestic and economic plans on track, you will be challenged by outside powers - Controlled by human players in a multiplayer match or period-inspired AI - that will pursue their own national agendas and interfere in the affairs of you and your allies. A shifting political and economic landscape keeps world powers busy adjusting plans, preparing for inevitable clashes.