In all honesty, Canada is a great nation with its bacon and NAFTA and whatnot with us Americans, but when it comes to the nations represented in not just Civ games, but usually ANY strategy-war-diplomacy-trade game, Canada falls by the wayside. It's not because we (the general human population) doesn't like Canada, it's just that in games like Civilization, each nation is known for being notable and doing something their own way and carving out a cultural hole the size of well, Canada.
The Greeks established Western Civilization, the English were the Empire Where The Sun Never Sets, The French, Germans, and Russians played huge roles in shaping the world today, China is the oldest known civilization to exist, many of the North-African and Middle-Eastern countries shaped the way humans work in our infant stages of civilization, even Portugal can exist alongside Spain because of its influence in the Colonial Era. The USA, despite being the youngest nation featured, was one of the biggest fists in the cookie jar when it comes to the last 200 years of world policy and culture, carving out an entirely different lifestyle and way of thinking compared to their Canada-common previous masters, the British.
So, sorry, but unless some die-hard Canadians make their way to be friend with Sid Meier or a Canadian game studio wants to make a Civilzation-esque game, we'll just have to settle for the mods.
-Chillz