Let's be friends (Getting AI to make peace)

[Captain Kwok]

To increase your chances of peace you need to remove items that makes them angry such as colonies/ships in their claimed space, destroying their ships, or try and buy them off with gifts if they'll except. Depending on the AI you have, this may help.

[Tim_Ward]

You've got to set the "turns before last war before friendly treaty" to zero in the AIs politics settings file to get it to make peace. I'm not sure how it actually works, but since there's no way to end a war without a 'friendly treaty'...

[Zereth]

Actually, that's probalby what Non-Intercourse treaties are for. It's not _war_, but it's not friendly either.