The colder regions are populated by those often called Barbarians. Out west, it's dominated mainly by cowboy horse archers, but north of the great lakes, grain and grass is too little, and the terrain too tough for large cavalry forces to be formed. The hunter-gatherers centered around the Canadian lakes have much less resources, and much more fury. Many travel the land to raid nearby villages, but it's very common to build barges for rivers and lakes, to attack kingdoms like Wisconsin, Michigan and others. They are somewhat similar to viking ships of old, except more equipped for freshwater travel. They're smaller, but provide less buoyancy, so barges are designed to hold a good amount of weight and make trips over the summer season.
The Canuck raiders are feared largely because of their size. Like other Barbarian societies, pretty much the entirety of the adult males are drafted into campaigns of war. They're hardened by the long winters and a belief in might. They often venerate powerful beasts like bears and wolves, and will often dress themselves in such skins to gain their powers. Their faces are also painted red, a sacred and mystical color in the north.