Two Civilizations can engage in an exchange of maps, or, with an embassy, Advances. A 5-turn peace treaty begins between two Civilizations who engage in an exchange.
Great Library entry[]
Diplomacy often calls for give and take and exchanges between parties. The Louisiana Purchase was one such exchange where France relinquished claim on much of America in return for an astonishingly small $15 million dollars. With this, the young United States doubled in size at the mere scratching of a ink-dipped quill. In more modern times, governments exchange technological as well as medical discoveries in the interests of promoting universal well being.