The population is 19,5 millions of people. The average population density is 2 people per 1 km. 25% are born overseas.
Political system of modern Australia is the sovereign state. Australia is a federated state, consisting of 6 states and 2 areas, formed Commonwealth of Australia.
The federal government is separated into three branches:
The legislature: the bicameral Parliament, defined in section 1 of the constitution as comprising the Queen (represented by the Governor-General), the Senate, and the House of Representatives;
The executive: the Federal Executive Council, in practice the Governor-General as advised by the Prime Minister and Ministers of State;
The judiciary: the High Court of Australia and other federal courts, whose judges are appointed by the Governor-General on advice of the Council.