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Adoption and formalisation

In the Balfour Declaration at the 1926 Imperial Conference, the United Kingdom and its dominions agreed they were "equal in status, in no way subordinate one to another in any aspect of their domestic or external affairs, though united by common allegiance to the Crown, and freely associated as members of the British Commonwealth of Nations". The term " Commonwealth " was officially adopted to describe the community.

These aspects to the relationship were formalised by the Statute of Westminster in 1931, which applied to Canada without the need for ratification, but Australia, New Zealand and Newfoundland had to ratify the statute for it to take effect. Newfoundland never did as due to economic hardship and the need for financial assistance from London, Newfoundland voluntarily accepted the suspension of self-government in 1934 and governance reverted to direct control from London. Newfoundland later joined Canada as its tenth province in 1949. Australia and New Zealand ratified the statute in 1942 and 1947 respectively.

Although the Union of South Africa was not amongst the Dominions that needed to adopt the Statute of Westminster for it to take effect, two laws — the Status of the Union Act, 1934, and the Royal Executive Functions and Seals Act, 1934 — were passed by the Parliament of South Africa to confirm South Africa's status as a sovereign state, and to incorporate the Statute of Westminster into the law of South Africa.