World Domination 2
Be patient and do not initiate a nuclear strike. It does not matter who fires the first shot, just who fires the last one.
Propaganda helps steal citizens from opposing countries. Stolen citizens will pad your population for the nuclear bombs that will fall on your country.
Help from friend
Start by making diplomacy with the player with the best city. Attack who he attacks with propagandas. This will make him to be friends with you. Keep using propagandas and stock up on weapons for later in the game. Once the first person is dead, you can use your friend to team up on another country, then in the end you can kill your friend.