Muskie
Warlord
Simple. Also don't start wars. If someone says "Backstab is such a harsh term" I don't think you get a diplomatic penalty for defending yourself then taking one of their cities. In my early BNW games, Japan was always attacking me. Eventually I and others made it so there was no more Japan. I still won diplomatically.
You can't be everyone's friend, you are better off forcing your religion and ideology to be the world one if you can. I even think I should have killed a City State that was totally in my way in my last but one game. But just attacking your nearest neighbour automatically because they share a border with you should have diplomatic consequences.
