The Government of South Australia, also referred to as the South Australian Government, SA Government or Her Majesty’s Government is the Australian state democratic administrative authority of South Australia. The Government of South Australia, a parliamentary constitutional monarchy, was formed in 1856 as prescribed in its Constitution, as amended from time to time. Since the Federation of Australia in 1901, South Australia has been a state of the Commonwealth of Australia, and the Constitution of Australia regulates its relationship with the Commonwealth. Under the Australian Constitution, South Australia ceded legislative and judicial supremacy to the Commonwealth, but retained powers in all matters not in conflict with the Commonwealth.