AI factions attack you because:
- You're Rich, and they want what you have.
- You're Poor, and can't defend yourself.
- You're Powerful, and that threatens them.
- You're Weak, and that presents them an opportunity.
- Your Borders are Undefended, inviting a surprise attack.
- Your Borders are Overdefended, which suggests you are about to attack them.
- You Trespassed one time on their land, which is simply unforgivable.
- While innocently marching 5 armies through your best province, they accidentally bumped into your city.
- You rudely killed their assassin, who was in your capital city trying to kill your faction leader.
- You refused to assassinate their faction leader when they asked you to.
- You allied with nobody, making you vulnerable.
- You allied with everybody, indicating that you're wishy washy.
- You signed a treaty with them, giving them a perfect chance to stab you in the back.
- You refused to sign a treaty with them, which they took as an insult.
- You are an infidel propagating a hostile religion.
- You share their religion, meaning your peoples are invitingly easy for them to subjugate.
- Your lands border theirs, making you their natural rivals.
- Your lands are distant, meaning they can invade you without risk of reprisal.
- You are the pope's favorite, and nobody likes the teacher's pet.
- The pope hates you, making you the obvious faction to attack.
- You are a human (non-AI) faction, which is inexcusable.
If you loot or exterminate a city, it reduces your reputation. Having said that, even if you never do so, you will be attacked relentlessly.
TW diplomacy has never worked and probably never will. I say ignore the diplomats and get to fighting.

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