Txurce
Deity
Hmmm, I didn't know giving the AI gifts made a difference. Does it matter if its a worthless gift like iron when everybody is in modern?
Does gifting a unit give a positive modifier too?
I don't think you can gift units to the AI - only to CS. The first 3 of those strengthen your relationship.
On question #2 I was more interested in finding out if going back on that promise causes the rest of the world to dislike me more or just the civ that made contact.
Going back on a promise to a civ to declare war only causes that civ to dislike you more.
I could be wrong here but doesn't the game say that more valuable gifts to the AI makes them more favorable? IE the amount of favor you get for it being calculated much the same way as in which the AI judges how much gold a certain resource is worth?
That's what it says. I don't know if that's how it works.
Another way to gain favor is to not declare war or denounce your own friends. If you make a declaration of friendship with someone, make sure to wait about 50 turns before declaring war/denouncing.
I don't know if a DoF expires in 50 turns. Has somebody confirmed that?