I didn't take a close look, but I would say diplomacy needs some work. You have no friends, Gandhi and Wang Kon are cautious, Shaka is annoyed, and Mao is furious. I usually try to keep atleast two friends (triangle diplomacy-- have your two friends be friends with each other as well to avoid other negative modifiers). I would have adopted free religion upon discovering the other continent were mostly Hindu.
Also, have you not built the Moai Statues? Would make both Philadelphia and Alexandria both much better cities (if you were to build lighthouses in them... I'm not sure why you haven't already).