Um, other than Switch625 here, I think many of you (respectfully being said, not trying to be rude) are missing the point. This game is about BUILDING a civilization that can stand the test of time, not necessarily choosing one that ended up making the cut in the real world.
Personally, this is what I would like to see happen (AND, it would coincidentally balance out all of the linked culture groups to 4 each after the expansion pack adds 8):
ADD Africa: Egypt, Nubia, Mutapa, Ghana
European: Guals, Celts, Angles, Huns(?)
American: Mayan, Anasazi, Olmec, Inca
Asian: Japanese, Chinese, Mongolian, Indian
Middle East: Babylonians, Persians, Assyrians, Hittites
Mediterranean: Etruscians, Carthaginians, Phoenicians, Macedonians (or Spartans, Athenians, or just Greek

).
Wish I knew some ancient tribal/empire names for some of those..but anyhoo that's what I wish would happen. Know it won't though

.