Australia

Australia was a human nation occupying the entirety of a continent of the same name in the South Pacific on Earth in the Sol System.

Various waves of Indigenous Australians inhabited the continent beginning about 65,000 years ago, prior to the first arrival of Dutch explorers in the early 17th century, who named it New Holland. In 1770, Australia's eastern half was claimed by Great Britain and initially settled through penal transportation to the colony of New South Wales from 26 January 1788, a date which became Australia's national day. The population grew steadily in subsequent decades, and by the time of an 1850s gold rush, most of the continent had been explored by European settlers and an additional five self-governing crown colonies established. On 1 January 1901, the six colonies federated, forming the Commonwealth of Australia.

Australia sent a large number of troops and military forces to fight as part of the British Empire and its allies in the Great War, between 1914 and 1916. Australian military forces took control of several of the German Empire's colonies in the South Pacific. Despite its military involvement on the Allied side, Australia was not targeted by the German Empire or its allies in the orbital strikes which ended the conflict.

Following its defeat in the Indian War of Independence, and with much of its empire having collapsed since the end of the Great War, Great Britain reorganised what was left of its empire into the Commonwealth of Nations in 1939, in which Australia was a founding member. Although Australia still maintained a constitutional monarchy, with King Henry IX as its head of state, the 1939 Statute of Westminster removed the ability of the Parliament of Great Britain to pass legislation in the country. All member states of the Commonwealth were declared to be "free and equal" as a result of the London Declaration the same year. Member states of the Commonwealth also became part of a monetary union using a single currency (the Commonwealth pound) and an internal common market with a standardised system of laws applying in all of its member states. The Commonwealth pound therefore replaced the Australian pound as Australia's currency. The Commonwealth of Nations became a model for future supranational organisations, such as the European Union and the Organisation of African Unity.

In 1968, the supranational political and economic structures of the European Union and the Commonwealth of Nations were combined to form the United Commonwealth. The Commonwealth pound was replaced as the currency used in Australia by the newly-established currency of the United Commonwealth, the Commonwealth credit.

The government of the United Commonwealth federalised in 1988. The Australian government was therefore effectively absorbed into the United Commonwealth Government in 1988, and Australia is largely regarded to have ceased to exist as a separate nation-state on that date.