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 of Avatar, and encompasses much of the eastern hemisphere. The kingdom is ruled by a confederate monarchy which operates under the Earth King. The people of the Earth Kingdom are proud and strong and adhere to a phil
osophy 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. The Earth Kingdom long withstood encroachments on their borders in the Fire Nation's century-long imperialist war. Other than the Avatar, the Earth Kingdom was the only real obstacle that hindered the Fire Nation from achieving world domination. Though the Water Tribe aided the Earth Kingdom in the War, the conflict progressed poorly and took a heavy toll on them as the years passed. This continued until the Coup of Ba Sing Se, when Princess Azula of the Fire Nation seized control of the Earth Kingdom capital city, Ba Sing Se.[1] By the following summer, the metropolis was occupied by the Fire Nation military, and although it had previously been asserted that the fall of Ba Sing Se would lead to the disintegration of any remaining Earth Kingdom forces, rebel fighters continued to resist foreign rule. This warranted Fire Lord Ozai's decision of burning the Earth Kingdom upon the arrival of Sozin's Comet.[2]
By the end of summer 100 ASC, Ba Sing Se was liberated from Fire Nation control by the Order of the White Lotus, ending the Fire Nation occupation of the city. This, in combination with the decisive defeat of Phoenix King Ozai, effectively liberated the remaining Fire Nation-controlled regions of the Earth Kingdom.[3]
After the end of the Hundred Year War, numerous Fire Nation colonies throughout the western Earth Kingdom were transformed into the United Republic of Nations, a fifth nation founded by Avatar Aang and Fire Lord Zuko.[4]
Seventy years after the conclusion of the Hundred Year War, the Earth Kingdom continues to be influential in world affairs with a representative on the United Republic Council.[5]
Source: http://avatar.wikia.com/wiki/Earth_Kingdom