Morale quests must be completed whenever you want to unlock a new city.
Click on the exclamation mark (!) above a city on the map to accept Morale quests for that city.
You may only unlock a city, begin building within its walls, and send reinforcements once all Morale quests are complete.
Morale Quest Types:
Campaign —— Eliminate nearby Bandits harassing the city
Donations —— Donate Food, Wood, and other resources to the city