According to the long title of the Australian act, its purpose was "to bring constitutional arrangements affecting the Commonwealth and the States to be brought into conformity with the status of the Commonwealth of Australia as a sovereign, independent and federal nation". The Australia Act (Cth and UK) eliminated the remaining possibilities for the UK to legislate with effect in Australia, for the UK to be involved in Australian government, and for an appeal from any Australian court to a British court. This formally separated all legal ties between Australia and the United Kingdom.
The Statute of Westminster 1931 removed the British Parliament's power to legislate for Canada,[3] as well as for the other Dominions (Australia [adopted 1942, retroactive to 1939], the Irish Free State, New Zealand [adopted 1947], the Union of South Africa, and the Dominion of Newfoundland [never ratified, joined Canada in 1949]), unless (sec. 4) the Dominion requested and consented to Imperial legislation.
Queen Elizabeth's constitutional powers over Canada were not affected by the act, and she remains Queen and Head of State of Canada.[22] Canada has complete sovereignty as an independent country, however, and the Queen's role as monarch of Canada is separate from her role as the British monarch or the monarch of any of the other Commonwealth realms