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The Australian Constitution guarantees the separation of church and state; there is no state religion in Australia. Although the nation is broadly secular and few are church-goers, three-quarters of Australians are nominally Christian, mostly Catholic or Anglican. A diverse range of other religions are practised.

In 1901, Australia adopted a federal constitution and became a self-governing dominion of the British Empire. Australian troops took part in both world wars. Since World War II Australia has been transformed by a massive immigration programme. Australia remains a constitutional monarchy with Queen Elizabeth II as head of state: a referendum to establish a republic was defeated in 1999.

Many plants that grow in Australia have special features to combat the forces of nature. Symbiosis is very common, as are plants with sunken stomata and large root stock. The plants are very hardy, and are generally able to quickly establish themselves so as not to miss available nutrients.

Two of Australia's most traditional takeaway dishes are the meat pie and sausage roll. These come in varying grades, ranging from the mass-produced factory outputs of Four-and-Twenty and Big Ben, sold on every street corner in milk bars, through to gourmet pies sold by specialist pie shops. There is an annual competition to find the 'Great Australian Meat Pie', and the winners are greatly removed from their fat-laden antecedents.

The name Australia derives from Latin australis meaning southern, and dates back to 2nd century legends of an "unknown southern land" (ie. terra australis incognita). The English explorer Matthew Flinders named the land Terra Australis which was later abbreviated to the current form. Previously, when the Dutch explored the area they named it Nova Hollandicus or New Holland.

Much of the area around Adelaide was once used for wine grape production, so that wine growing districts (such as the Barossa Valley, for which Adelaide and South Australia are well known) remain within a short drive of the city outskirts.