All the States and areas of Australia that are self-governing are different territories, and have their own system of courts and parliaments. The systems of laws in each state are influential on each other, however not binding. Laws gone by the Parliament of Australia apply to the entire of Australia.
The arranged system of law and government now in force in Australia is historically reliant for its legal validity on a series of British statutes, notably including the Commonwealth of Australia Constitution Act 1900. The authority of the Uk Parliament to enact those statutes relied on the acquisition of the Australian continent as a territorial possession of the British Crown. Although the laws of the Australian colonies varied from the UK in numerous respects from the beginnings of settlement, the underlying patterns of idea mirror the common law tradition as received from Britain.