Thanks for this comprehensive list.
A couple minor corrections/additions:
1) I think I've seen "years of peace" at +2 and "Open Borders" at +3.
2) I've seen "you have wisely chosen your civics" at +5, or maybe even +7 (with Ghandi, after my civics exactly matched his). Some leaders seem to care about civic choices more than others.
3) Mutual military struggle can be as high as +4. (In Earth 1000AD scenario, where everybody is at war with Byzantines and Vikings for the whole game.) I guess it's affected by number of wars, as well as duration.
4) I've sometimes had "years you've supplied us with resources" bonus with what I considered to be fair trades. Maybe AI values resources differently than I do.
5) Defensive pact gives +1 (maybe higher with time) to your partner and -1 for all of their "enemies" (possibly same definition of "enemy" as all other deals). I never tried permanent alliances, but I suspect it would have a similar effect.
6) About religious modifiers, I've heard that they are related to how widespread various religions are within AI empires. This would explian why this modifier is always high for theocracies and much lower for civs with multiple religions in their cities.
A couple minor corrections/additions:
1) I think I've seen "years of peace" at +2 and "Open Borders" at +3.
2) I've seen "you have wisely chosen your civics" at +5, or maybe even +7 (with Ghandi, after my civics exactly matched his). Some leaders seem to care about civic choices more than others.
3) Mutual military struggle can be as high as +4. (In Earth 1000AD scenario, where everybody is at war with Byzantines and Vikings for the whole game.) I guess it's affected by number of wars, as well as duration.
4) I've sometimes had "years you've supplied us with resources" bonus with what I considered to be fair trades. Maybe AI values resources differently than I do.
5) Defensive pact gives +1 (maybe higher with time) to your partner and -1 for all of their "enemies" (possibly same definition of "enemy" as all other deals). I never tried permanent alliances, but I suspect it would have a similar effect.
6) About religious modifiers, I've heard that they are related to how widespread various religions are within AI empires. This would explian why this modifier is always high for theocracies and much lower for civs with multiple religions in their cities.