The Crown was further separated amongst its Dominions by the Statute of Westminster in 1931, an Act of the British parliament, which gave New Zealand and other Dominions the authority to make their own laws in all matters, while requiring them all to seek each other's assent for changes to monarchical titles and the common line of succession. The British Parliament specifically gave up any claim to legislate for a Dominion, save at its own request. New Zealand ratified the Statute in 1947, after the passing of the Statute of Westminster Adoption Act 1947. A convention persisted that New Zealand prime ministers consulted the British government on the appointment of governors-general until 1967.