Oss people

The Oss people, also known as the Osstrals or simply White Australians, are an ethnic group in Oceania native to Australia. They are present largy in Antarctica, Australia, and Indonesia, and are present as minorities in North America, India, China, Indochina, and Africa.
The Oss trace their ancestors back largy to the European colonizers of Australia from the 19th century, as well as partially to the Aboriginal Australians who were living there already. The Oss ancestors were part of colonisation efforts of the then British empire, though broke away to form the Commonwealth of Australia in the early 20th century. Immigration from other countries, notably China, would follow throughout the century, though due to the then desert interior, population growth would be slow. Up until The Disaster, the Australian Europeans were somewhat disunited, and barely culturally distinct from other anglo countries, though due to Australia being largely neutral in the conflict, they came out relatively unharmed. Under the harsh conditions and uncertain future, a sort of unity would form and a proto-oss identity would form. They would be tested when the Ecological Republic began forming, as Australia was one of the few nations to resist ER rule. While falling to the ER nonetheless, they still unified somewhat in the face of rule. When the Terrawars where launched, the Oss populations would largy dwindle and be overshadowed by the emerging Yatralls, though would bounce back in the XX century. When the EGR enacted the Autonomy proclamation, Australia would be balkanised, and many sub-groups of Oss identity would form. By the 40th century however, they where largy reunified. 
The Oss and the Yatralls share the continent of Australia, roughly half of the population being composed of each. A rivalry between the two has been present throughout most of history, and many atrocities have been committed by both in the hopes of annihilating the other.