When a civilization develops Nationalism, it can Mobilize its economy for war. Mobilize your economy using the "Mobilization" button on the Domestic Advisor. Effects of Mobilization * During mobilization a city building a military unit produces one extra shield in every square that is already producing at least one. A civilization that is mobilized: * May only build military units and military city improvements. * May not build peacetime improvements. * May not return to Normalcy until a Peace Treaty is signed. During Mobilization workers, settlers and explorers can be built, but will not receive the production bonus.