List of proposals looks like this:Payments & State Gifts - gifts improve diplomatic relations between factions and make your offer more favorable. It is good to use this option from time to time, so that the target faction will have more respect for you, which will make future negotiations easier.Military access - it allows your troops to enter another faction's territory without any repercussions.
This option is useful when you want to attack distant enemy.Non-aggression pact - it improves relations between factions. This is the first step for future alliances.Defensive alliance - it guarantees support from a faction when you gets attacked.Military alliance - it allows you to attack another faction together with your ally.
Rome is the dominant power on the Italian peninsula, and stands at a turning point in history. Arverni Descended from a long line of Celts, the warlike Arverni are one of the most powerful tribes of central Gaul.
After declaring the war you can ask your ally to join the war.Declaration of war - as the name suggests it starts the war between factions.Satrapies & Client States - a faction which becomes a protectorate pays a tribute every turn and is connected with you by a defensive alliance. If the treasure is empty, you won't get any money. Protectorates are a good way to conquer the land without the need to monitor its expansion.Form confederation - this option is available for barbarian tribes. You can join your forces with another tribe with common past - its land and army will become yours. This option is often available only in case of tribe which is much weaker than yours.Trade agreement - it starts trading with given faction. Profits depend mainly on raw materials you have - if you do not have enough marble for example to build V level temple, trade agreement with appropriate country will allow you to import this material. In order to start trade with another faction, there must be a connection to it by land or sea.
Due to lack of such a path, some countries are not able to establish trade relations in early turns of the game. A perfect example here is Sparta.