The City-State follows its Suzerain into war and peace.
Suzerainship is much like much like being the ally of a City-State in Civ V, but it is not entirely the same. Second, if a civilization sends at least three Envoys and has more Envoys in the City-State than any other civilization, that civilization becomes the Suzerain of that City-State. In addition, any civilization can gain these bonuses, regardless of whether or not they are the City-State's Suzerain (see below). The kind of bonus provided depends on the type of City-State Envoys are being sent to. 6 Envoys cause the City-State to increase the bonus provided at 3 Envoys.3 Envoys cause the City-State to provide an additional bonus to all the cities in a civilization, provided they have a specific district and/or are building something.One Envoy causes the City-State to provide the bonus only to the Capital city of a civilization.First, it determines the amount of bonuses the City-State provides and where it provides them. The amount of Envoys sent to a City-State determines many things. These Envoys can be used whenever and sent to whomever the parent civilization wants. Certain civics provide one, two, or three free Envoys when completed.When quests are completed, an Envoy is gained but it goes directly to the City-State(s) the quest was completed for. Quests are given upon meeting a City-State or upon the arrival of a new era. These quests are generally non-competitive and require a civilization to complete a certain task, such as discovering a eureka moment for a certain tech or defeating a nearby barbarian camp. City-States provide quests that each civilization can complete.Democracy, Fascism, Communism: 7 points per turn, 3 Envoys at 200 points.Monarchy, Theocracy, Merchant Republic: 5 points per turn, 2 Envoys at 150 points.Oligarchy, Autocracy, Classical Republic: 3 points per turn, 1 Envoy at 100 points.Chiefdom: 1 point per turn, 1 Envoy at 100 points.When these points hit a limit, 1-3 Envoys are earned (based on which government is chosen) and can be sent to any City-State. Influence points: (Not to be confused with the influece scale) Different tiers of governments add more or less amounts of influence points per turn.The first civilization to meet a City-State automatically gains one Envoy with that City-State.
Envoys act as the delegates you send to a City-State, they cannot be removed from a City-State, and they are earned in a variety of manners. Most notably, Civ VI has ditched the influence scale in favor of an envoy system. Yet, while their essence may be the same, the mechanics of City-States have changed greatly from Civ V.