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Chicken Spadge

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Could anyone tell me what factors ai nations use when deciding whether to join your alliance or not.

I've noticed that your relations have to be at least above -100, and I assume that the diplomatic strength of your monarch plays a significant part, but are there any other factors involved?

I'm asking because there have been occasions when I've had very good relations with the country concerned, a good diplomacy level, and joining my alliance would have actually make good sense for that country, but I've still been repeatedly turned down.
 

MichaelM

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If you already have four allies (maybe five, can't remember, but it's in defines.txt), no one else will join. That's what I would look at first.
 

Chicken Spadge

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Yes, I know about the numbers limit. I should have mentioned that. I've been refused even when I've had no allies already or only one or two.
 

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Yes, I know about the numbers limit. I should have mentioned that. I've been refused even when I've had no allies already or only one or two.

Not entirely certain about this but I think the AI takes into account some estimation of your strength as well as your proximity. Neighbors with good relations are far more likely to an alliance, as are weaker nations when you are strong.