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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.

Australia's population has more than doubled since the end of World War II, spurred by an ambitious postwar immigration program. In the 19th century, Australia enacted strong measures to prevent immigration by nonwhites. After World War II, immigration from Greece, Turkey, Italy, and other countries increased Australia's cultural diversity. In 1973, Australia officially ended discriminatory immigration policies, and substantial Asian immigration followed. By 1988 about 40% of immigration to Australia was from Asia, and by 1997 Asians constituted about 5% of the population. The indigenous population, the Australian Aborigines and Torres Strait Islanders, make up 2.2% of the population, according to the 2001 Census. In 2001, the political campaign was dominated by issues of immigration and national security and there still remains substantial anxiety among Australians concerning immigration.

Sydney is a significant global and domestic tourist destination and is regularly declared to be one of the most beautiful and livable cities in the world, admired for its harbour, beautiful coastline, warm and pleasant climate and cosmopolitan culture. Sydney significantly raised its global profile in recent years as the host city of the 2000 Summer Olympics. The city's name is pronounced "SID-nee".

Most of the Australian population descends from 19th and 20th century immigrants, most from the UK and Ireland to begin with, but from other sources in later years. Although the Australian colonies were founded as a penal colonies (except for South Australia and Western Australia - with the latter later receiving convicts), the transportation of British convicts to Australian colonies was gradually phased out between 1840 and 1868. During the "gold rush" of the late 19th century, the convicts and their descendants were rapidly overshadowed by hundreds of thousands of free settlers from many different countries: for example, in the 1850s about two per cent of the combined populations of Britain and Ireland emigrated to New South Wales and Victoria.

Australia has had a significant school of painting since the early days of European settlement, and Australians with international reputations include Sidney Nolan, Russell Drysdale, and Arthur Boyd—not to mention the prized work of many Aboriginal artists. There are excellent art galleries (even in surprisingly small towns); a rich tradition in ballet, enlivened by the legacy of Dame Margot Fonteyn and Sir Robert Helpmann; a strong national opera company, Opera Australia, made prominent by the world renowned diva Dame Joan Sutherland; and symphony orchestras in all capital cities, in particular the Melbourne and Sydney symphony orchestras. In ths field, conductor Sir Charles Mackerras has achieved international renown.

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.

Australia may have been sighted by Portuguese sailors in 1601, and Dutch navigators landed on the forbidding coast of modern Western Australia several times during the 17th century. Captain James Cook claimed it for Great Britain in 1770. At that time, the native population may have numbered 300,000 in as many as 500 tribes speaking many different languages. The Aboriginal population currently numbers more than 300,000, representing about 1.7% of the population. Since the end of World War II, efforts have been made both by the government and by the public to be more responsive to Aboriginal rights and needs.

The Great Barrier Reef, by far the world's largest coral reef, lies a short distance off the north-east coast of Australia. Uluru, in central Australia, is the second largest monolith in the world.

Australian literature began soon after the establishment of the country by Europeans. Early popular works tended to be of the 'ripping yarn' variety, telling tales of derring-do against the new frontier of the Australian outback. Writers such as Rolf Boldrewood, Marcus Clarke and Joseph Furphy embodied these stirring ideals in their tales and, particularly the latter, tried to accurately record the vernacular language of the common Australian. These novelists also give valuable insights into the penal colonies which helped form the country and also the early rural settlements. The transportation of prisoners, emigration to this once remote nation and the persecution and prejudice suffered by its indigenous peoples all contribute to a sense of alienation and exile which can be seen to run through at least the early writings of Australia.

A sun-baked city that can go weeks or even months without substantial rainfall, one of Perth's main attractions lies in the pristine quality of its beaches. Unbroken stretches of golden sands run the entire length of the city's coastal suburbs.

In common with many other developed countries, Australia is currently experiencing a demographic shift towards an older population, with more people retiring and fewer people of working age. Similarly, a large number of Australian citizens (950,000 as of 2004) live outside of their home country. This number (almost 5%) represents a higher per capita percentage of overseas residents than many other countries including the United States. This phenomenon was, until recently, given little attention by the Australian government and media, but the term Australian Diaspora has now joined the Australian vocabulary.

Since the end of World War II, the population of Australia has more than doubled; non-European immigration, mostly from the Middle East and Asia, has increased significantly since 1945 through an extensive, planned immigration program. From 1945 through 1996, nearly 5.5 million immigrants settled in Australia, and about 80% have remained; nearly one of every four Australians is foreign-born. Britain and Ireland have been the largest sources of post-war immigrants, followed by Italy, Greece, New Zealand, and the former Yugoslavia.