The British Parliament enacts the Statute of Westminster 1931, establishing legislative equality between the self-governing dominions of the Commonwealth of Australia, the Dominion of Canada, the Irish Free State, Dominion of Newfoundland, the Dominion of New Zealand, and the Union of South Africa.

Statute of Westminster 1931 formalises Australian autonomy.

New Zealand ratifies the Statute of Westminster and thus becomes independent of legislative control by the United Kingdom.