Diplomatic states

Diplomatic states are a part of diplomacy defining the current formal relationship between you and the other civilization.

States

 * Neutral - you have encountered a civilization, but have no relationship with it.
 * Trading - trade exists between your colonies and theirs. (indicated by a yellow line)
 * Allied - a mutual commitment to defense exists between you and them. (indicated by a green line)
 * At War - whether it's a trade dispute or a war of annihilation, you and them are fighting an all-out war. (indicated by a red line)