If you make another faction your vassal, they will still be visible on the map, but their foreign policy will still depend on you; they will pay tribute to each train (a percentage of their revenues). As with confederation, you need a high diplomatic level to make another faction your vassal. Each resource you export brings a sum of money per train. The revenue you receive from the resource can be verified by indicating the resource listed in the Diplomacy with the Mouse tab. To check how much money you get from trading with a group, you have to float on the icon of the trade agreement, next to the group given in the diplomacy tab. I have never seen evidence that more commercial resources would increase the likelihood of someone agreeing to a trade agreement. The diplomatic system is very veiled here. I have seen that groups with 200-plus relationships are opposed to profitable trade for them and that groups with 5-strong relationships accept the same trade. Trade is crucial to winning gold, and the more deals you make, the more gold is added at the end of each round. At the beginning of the game, the neighboring nations will not attack you yet. Take this opportunity to focus on investing in trades. Trade is an exchange of goods that you can produce in certain buildings (wood, iron, exotic animals, etc.). You can act with another group if you don`t have the resource you`re acting on – otherwise they won`t be interested.
Different goods have different prices, the more income from trade depends on the amount of resource you produce. In addition, by clicking on a group in the tab on the right, you will see a list of contracts and agreements binding the group, as well as some information about the commercial goods they have (the ones they import and export). Here you can find some personal information about group leaders. At the bottom of the screen are contracts signed by different factions. If you show with the mouse above the symbol of the given fraction, you will see a list of factors that affect your relationships. There are several possibilities: it is because of the Lore. If you were an elf, you wouldn`t negotiate with a vampire. Animal men, greenskin and chaos warriors cannot act.
It also depends on the characteristics of the political groups. A group like Kislev, which has passive quality, is by no means to act. Although diplomacy is often limited to other factions of the same race, you should take a moment to learn more. Diplomacy allows you to conclude trade agreements, non-aggression pacts and even military and defence alliances (if your relations are good enough). In the case of fractions of the same race, you can also try to integrate them under your reign. Political groups can agree on trade through diplomacy. A trade agreement between two factions This is just another symptom of the larger problem called «Total War Diplomacy», something that has been shown very little love and attention since CA was first born. They even took poor little diplomatic boats and cars on the campaign map. They waved their finger against diplomacy and also took trade routes. Trade can take place between two political groups in campaign mode. Trade agreements can be concluded on the diplomatic screen, allowing political groups to exchange trade resources and generate additional revenue for both factions.
Tilea and Estalia are also very difficult to obtain as business partners for reasons I can`t understand. Note: The Tomb Kings are the only faction that actually uses resources for their mortuary cult mechanics (Edit: a similar mechanic called forgery has been added to the dwarves in Warhammer 2 only since this response was originally published). For all other groups, resources only increase the value of trade agreements. So you`re generally right to think that these resources are not actually used by the trading partner, but not in this particular example. On the left side (of your page), the user interface shows you how much money you earn with trade and the resources you have in parliament commercia