Settlements can inherit different kinds of states. These are not limited to one at a time, as such a settlement can inherit multiple states at the same time.
These states can affect the offered prices for trade and other items, the availability of recruits, as well as being an indicator of which type of contract this settlement is likely to have available. Percentages mentioned below (for states that affect trade) are applied multiplicatively on base price modifiers for that settlement (ie a settlement that usually has a selling price modifier of 19.6% (all regular items sold at 19.6% of worth) will now have a selling price modifier of 21.6% in the event of Ambushed Trade Route (+10%)).
Unknown settlement status ( game files )