Fixed that for you, country does not equal civilization. I thought it was bad enough to have Brazil, please don't add any more modern countries that are barely 100-200 years old.
What about USA? Been in the game since the start, older, but how much older is America than Canada or Australia?
Canada and Australia are nothing more than British colonies, well, so was USA.
US is not an original civilization, just like Brazil, and if you go by your way of thinking, neither one of them belongs in the game!
You want unique civilizations based in part on their factual climate, eh?
Canada's cold climate nation, just like Norway or Finland that they could add. You're telling me that having, for example, the Inuit in the game instead of any of these countries makes more sense? What advancement to world culture, what wonders, what history as a nation do/did the Inuit present/create?
And this is Civilization we're talking about here, game based in large part on history, not some fantasy game.
Just what World Wonders, inventions, cultural advancements have such tribes as:
Zulu, Shoshone, or Huns ever accomplished? (besides militaristic ones)
The game's flat out wrong from the start by pitting half-barbaric tribes like Zulu against such truly great Civilizations like Rome or Greece.
In reality, the only way Zulu would be able to compete against Rome or Greece would be by military conquest.
Creators are plain wrong by letting such tribes compete on even terms with history's truly great civilizations, nations who build great wonders, invented most of the civilized advancements you get to research in the game, invented and built the buildings you build in your cities, the military units, invented the social policies you get to choose. Ever heard of a Shoshone built Amphitheatre? A Zulu great Wonder?
I'm not saying such tribes did not in any way contribute to Earth's History of Civilization, but their contribution is much inferior compared to that of Egypt or China, for example.
So the developers should really look into that.
Every nation/civilization included in the game should be far more unique from others, there should be a lot less GENERIC stuff, less generic units, buildings, wonders, less generic everything.
Truly great Civilizations should be able to hold (at least a slight) advantage in the game, as far as cultural development is concerned, and, if you want to play as the Huns, go right ahead, but: no Wonders available for you, no Amphitheatres or even Libraries. Your only chance: conquer them civilized ones: by fire and sword.
Being from Belgium, I'm sure you'd suggest Belgium as one of the nations to be added?
And I'd say why not?, except, isn't Belgium nothing more than Francophonized Netherlands?, where the Spanish ruled for many years in the past as well?
My other suggestions:
Macedonia (I don't mean the modern one (FYROM), I mean Macedonia of Phillip II and his son, Alexander the Great), Visigoths (or Goths altogether), Papal state (Vatican), Bulgaria, Ukraine (Kiyevan Rus'), Lydia, Harappan Civilization.