Yeah it starts in 4000 BC but it ends around 2000AD. I don't see any germanic tribes or Guals or Iberieans. But, I do see French, Germans, Spanish, and Portugese Civilizations that have had a far more important impact upon the world than the tribes that they decended from.The piont of the game is to build a civilization that can last for all time. Therefore civlizations that have had an enormous impact on the the course of history should be included in the game, not tribes that barely (if at all) achieved "civilization" status. Anyways are not the civilizations called tribes at the begining of the game. But, since most of those civs are already included in the game, the civs that will be added should be juged first on how well the fill up a world map, then on how powerful they were compared to the nations around them, and lastly on they're contibutions to technology, society, ect. and their impact on history. So, that being considered here is my list:
Ghana
Ethiopia
Khemer
Inca
Souix
Hebrews
Austalians
The Polynesians would be good, but they are so easy to add that I included they Austalians insead (the entire contenent is empty now).