Just an observation: the aggressiveness and behavior of North American natives seems to vary widely as a function of what faction the player is playing. If the player is Britain, France or possibly Spain, the natives go berserk from turn 1.

However, playing as UP, still in 1730 I see Iroquois being peaceful wigwam dwellers (not at war with anyone), Cherokees are at war with plain Indians, not anyone else (not even Spanish in Florida). Hurons live a peaceful life as well...

Both behaviors observed on VH campaign setting.