I sort of like this list, but I think it has some issues. Too many Native American tribes, too few highly influential civilizations from the old world that I'd like to see included in a Civ game, including a couple that I think would make interesting new "bad guy" civs so Monte doesn't always have to be the villain every time. I've marked these with a *
Americas-
America
Aztecs
Mayas
Incas
Olmecs
Europe-
Greece
Rome
England
France
Germany
Russia
Scandinavia
Spain
Byzantium
Asia-
China
India
Japan
Mongolia
Korea
Khmers
Xiongnu/Huns*
Polynesia
Middle East-
Arabia
Persia
Egypt
Sumeria
Assyria*
Turks
Babylonia
Africa-
Mali
Ethiopia
Nubia
-Shona
-Yoruba
Realistically, one of those last two will be replaced by Zulu, which is just too popular and well-known.
I'd LOVE to see Assyria in a Civ game. They were a military powerhouse in the middle east for a thousand years in the Bronze Age, and they conquered a vast empire spanning the entire fertile crescent from the Persian plateau all the way to the Nile. Their achievements aren't touted much in History classes, due to how universally hated they were by their contemporaries, who disparaged them in the ancient textual sources. When their capital Nineveh fell in 612 BC, to an allied force of Medes, Scythians, Babylonians and Susianians, much of the world rejoiced, and many of their cities, temples, histories and records were destroyed. So thorough was the destruction of their memory that two centuries later, Xenophon came upon the ruins of Nineveh and the local farmers who lived there told him they thought it was a Medean city. They were cruel rulers, but mighty people, who some historians claim "broke the middle east to the yoke of empire", and would make a great "villain" to play against.
The Xiongnu and the Huns were probably the same people. Atilla was the "most barbaric man alive" according to the Romans. Gotta love that. The Chinese hated them and built the Great Wall to defend against their constant raiding, and the Romans had constant strife in their northeastern territories because they couldn't build their own GW once China did LOL. These would be another great new enemy to play against if the AI just sent in lots of horsemen to harrass and raid.