I have 39% of the land area and 45% of the population , with 35% being listed as the requirments for a domination victory on the victory screen. Any ideas?

Save game?

Did you or another civ already win by another condition? (i.e., victory points, culture, diplomatic). Also, upload the gamesave.

No, no one else has won, as far as I know. I built the War Council(UN) and have never called a vote.Save file (http://www.civfanatics.net/uploads6/Sword_of_the_Shogun.SAV)

According to the Victory Status Screen in the save game, you have already won by being elected as Leader of the War Council.