The Fire Nation
Leader: Fire Lord Zuko (taken by me)
The Fire Nation is one of the world's four nations and five sovereign states. It is an absolute monarchy led by the Fire Lord and home to most firebenders. Geographically, the nation is located along the planet's equator in the western hemisphere and is composed of several islands. Its capital is simply known as the Fire Nation Capital.

The Fire Nation is the second-largest nation in terms of area, following the Earth Kingdom, while its economy is the most powerful in the world; its strong industrial sector and extensive technological developments not only enabled the Fire Nation to create an extremely powerful military, but also initiated worldwide modernization and globalization. Before the foundation of the United Republic and the following global technological revolution, it was also the strongest and most advanced country in the world.

The military of the Fire Nation was engaged in an imperialistic century-long war with the other three nations from 0 to 100 AG, during which the country committed genocide against the Air Nomads, conquered vast swathes of the Earth Kingdom, and instituted raids that annihilated the waterbending population of the Southern Water Tribe, save for one bender. The ruler directly after the conclusion of the Hundred Year War, Fire Lord Zuko, used Fire Nation resources to help rebuild the world, start the Harmony Restoration Movement, and eventually create the United Republic of Nations. The Fire Nation Capital is guarded by the Great Gates of Azulon, named after the grandfather of Zuko and Azula, Fire Lord Azulon.

Air Nomads
Leader: Tenzin
Air Nomads is the collective term for the monastic order of men and women who practice the discipline of airbending and their seclusive, theocratic society. One of the four major nations, the Air Nomads were wanderers by definition, but had four air temples, one at each corner of the globe, hidden away atop mountain ranges and under cliffs, in the northern Earth Kingdom and on three remote islands. Unlike the other nations, the people of the Air Nomads were, without any seen exception, all benders due to the high level of spirituality of their people.

The Air Nomads were a peaceful race who were wiped out by the Fire Nation. They lived in large temples and traveled the world on flying bison. They were the most spiritual of all the cultures and lived in harmony with nature. They also were fun-loving and had a strong sense of humor.

The Air Nomads made up the smallest of the four nations in the world. They had a small economy, based entirely on limited agriculture. The population of the Air Nomads was small compared to even the Water Tribe and was far smaller than either of the world's two major powers, the Fire Nation and the Earth Kingdom.

Water Tribe
Leader: Tribal Chiefs
The Water Tribe is a collective term for the nation of people who practice the art of waterbending. It is one of the original four nations and its citizens primarily inhabit the northern and southernmost regions of the globe, near both poles. Many people of Water Tribe ethnicity also live in the United Republic and there is a small community of waterbenders that populate the Foggy Swamp in the Earth Kingdom, although they were isolated from their sister tribes for generations and others were largely unaware of their existence until they were stumbled upon by Avatar Aang, Katara, and Sokka.

The people of the Water Tribe are generally peaceful, and strive to live in harmony with nature and the other nations of the world. There are two primary divisions of the Water Tribe, the Northern Tribe and the Southern Tribe, though both were at least de jure governed by the Northern chief until 171 AG.

Earth Kingdom
Leader: Earth Monarch
The Earth Kingdom is one of the world's four nations. Spanning an entire continent as well as several subsidiary islands, it is the largest and most populated sovereignty in the world and encompasses much of the eastern hemisphere. The kingdom operates as a monarchy under the rule of a king or queen, although the 54th Earth King, Wu of the Hou-Ting Dynasty, announced his intention in 174 AG to abdicate the throne in favor of splitting the nation into independent states with democratically elected leaders, akin to the political system used in the United Republic of Nations.

The people of the Earth Kingdom are proud and strong and adhere to a philosophy of peaceful coexistence and cooperation with the other nations of the world. Earthbenders use their abilities for defense and industry and fiercely defended their cities against Fire Nation attacks during the Hundred Year War. It also has a large economy based on agriculture and limited industry, though it is not as economically powerful as the Fire Nation, which benefits from advanced technology.

The Earth Kingdom is characterized by significant ethnic and cultural diversity, a consequence of the country's vast territorial expanse. As a result, it suffers from high levels of local autonomy and ethnic conflict, both of which began accelerating as the central government grew weak. Despite this division, the people's recognition of the Earth Kingdom as a single political entity is largely strengthened through the communal belief in a shared history and identity.