Japan declared war on me and I captured a city before making peace. I want to give the city back since it's not very good and I am not interested in fighting Japan right now. Ideally, I would liberate the city to get a nice diplo bonus, but the only option is to gift the city. It just says Osaka instead of Osaka (liberate). The city tile is 94% Japanese culture, but the borders had not popped before I captured it. Does anyone know what causes the (liberate) option to appear in the trade screen? Many thanks.