Shamanism: The Practice of being a shaman.
Shamans: Not sure how you guys want to do this unit. But in Native American folklore, shamans had the unique ability to communicate with sprits of animals and the sprits of ancestors, perhaps theyd have a "morale" effect on the city they are garasoned in, like a millitary unit would, only in all government types. Or the Shaman could have an ability to reveals a section of the Fog of War(by communing with the land etc).
The Mesoamerican tribes would get Priests(use the same unit for them) instead of Shamans. Priests in the Mayan and Aztek cultures were evil, brutal, and oftentimes cruel indivuals who carried out the accual human sacrifices, and sometimes, such as the time of the Aztek "Flower War" demanded even more sacrifices!
Therefore, Mesoamerican priests would get a decent combat ability(an attack rating of 1 or 2), and the enslavement power.
Unique Units and Flavor Units:
I know that Unexisted wanted Flavor units for all the different tribes. Lets see.
All Tribes:
Nomadic Age:
Brave(Same as warrior combat values, the NA tribes version has one extra movement point) Braves were the average fighting warrior of a N.American native tribe, but in the Native America mod, they also could represent a NA basic warrior for any civ.
Tribal Spearmen

Same as Spearmen, only use a NA looking unit for it) The spear is a very old, and basic weapon, the earliest spear users did not have armor, and this was the same level of technology that the NA tribes, both Northern and Southern, started off with(Stone Age). The Tribal Spearmen's weapon is made of Wood, and therefore, the unit becomes availible when Woodworking is researched
Canoe(Appeared in DyP): A small, non combat capable, very early boat.
Archer(Use normal unit)
Kingdom Age:
Spearmen(Use the normal spearmen unit, but have the values of the Pikeman). Becomes availible with Bronze working.
Elite Bowmen(Upgrades from Archer, looks the same, only uses the Longbowman's combat values)
Elite Brave(Uses Swordsman combat values) Represents a refining of the combat techniques of the past in NA native tribes, can attack twice in one turn(represents the great speed that NA raids often moved in)
Native Galley(Use that fictional unit RF suggested, use Galley combat values) Upgrades from Canoe. Note: The Meso and South Americans sould build normal Galleys instead.
Post Columbian Era:
Mounted Brave(Uses Knight Values, some tribes Mounted Brave look different)
Native Shooter(Upgrades from Elite Bowmen and Elite Brave, uses Musketman combat values)
Azteks:
Jaguar Warrior(already in game)
Eagle Warrior: Replaces Spearmen, has one extra movement point, and one extra attack point. Can retreat from combat like a mounted unit.
Mayans:
Mayan Javelin Thrower: Upgrades from archer, replaces Elite Bowman, can enslave
Incans:
C-Scout(Already in Game)
Inti Warrior: Replaces Elite Brave(use Medival Infantry Combat values, or use swordsman combat values, and add one attack and defense point)
Iroquios:
Mounted Warrior: Replaces Mounted Brave, has one extra attack point.
Sioux?:
Ghost Dancer: Replaces Elite Brave, has one extra attack point, can retreat from combat like a mounted unit, but doesn't attack more than once each turn.