Unfortunately, one single alliance is usually not strong enough to win the server. Therefore, people can and will use diplomacy to prevent future wars or increase their chances of winning. There are three possibilities: confederation, non-aggressive pact and war.
A confederation is a strong bond between two or more alliances. In this case, alliances help each other and cooperate between themelves more. Usually, they help each other by sending reinforcements or resources if needed. Also, they can manage massive attacks together, share wars and fight their common enemy. There’s a limit for 3 confederations per alliance.
A non-aggression pact (NAP for short) is used when two alliances do not want to attack each other, but they do not want to help each other either. It’s commonly used between strong alliances which would damage eachother badly and they want to avoid such an event. These are also limited to 3 per alliance.
War is a heavy struggle between two alliances. Alliances on the confederation list are usually standing behind alliances in wars.