Avatar Nations Mask

The world is traditionally divided into four nations: the Water Tribe, Earth Kingdom, Fire Nation, and Air Nomads. Each nation is culturally unique and associated with one bending technique: waterbending, earthbending, firebending, and airbending, respectively. An even distribution of power among the four nations is believed to keep balance in the world, and a fall or increase in the strength of one nation can engender a disruptive imbalance.

Despite these beliefs, the world's political and cultural landscape did not overlap with the Four Nations for most of history. The nations were instead split into multiple states, while people of the different nations often intermingled to form new cultures and ethnic groups