The Statute of Westminster 1931 (22 & 23 Geo. 5. c. 4) is an act of the Parliament of the United Kingdom that significantly increased the autonomy of the Dominions of the British Commonwealth.
Passed on 11 December 1931, the statute increased the sovereignty of the self-governing Dominions of the British Empire from the United Kingdom. It also bound them all to seek each other's approval for changes to monarchical titles and the common line of succession. The statute was effective either immediately or upon ratification. It thus became a statutory embodiment of the principles of equality and common allegiance to the Crown set out in the Balfour Declaration of 1926. As the statute removed nearly all of the British parliament's authority to legislate for the Dominions, it was a crucial step in the development of the Dominions as separate, independent, and sovereign states.
Its modified versions are now domestic law in Australia and Canada (including Newfoundland and Labrador). It is no longer in effect in New Zealand, and has been implicitly repealed in former Dominions that are no longer Commonwealth realms.
History
England, and Britain after 1707, had colonies outside of Europe since the late 16th century. These early colonies were largely run by private companies rather than the Crown directly, but by the end of the century had (except for India) been subsumed under Crown control. Oversight of these colonies oscillated between relatively lax enforcement of laws and centralization of power depending on the politics of the day, but the Parliament in Westminster always remained supreme. Most colonies in North America broke away from British rule and became independent as the United States in the late 18th century, where after British attention turned towards Australia and Asia.
British policy with regards to the colonies began to be rationalized and streamlined in the 19th century. Responsible government, wherein colonial governments were held accountable to legislatures just as the British cabinet was responsible to the British Parliament, was granted to colonies beginning with Nova Scotia in 1848. Confusion existed as to what extent British legislation applied to the colonies; in South Australia, justice Benjamin Boothby caused a nuisance by striking down several local laws as contrary ("repugnant") to the legislation in Britain. Westminster rectified this situation by passing the Colonial Laws Validity Act 1865 (28 & 29 Vict. c. 63), which allowed the colonies to pass legislation different from that in Britain provided that it was not repugnant to any law expressly passed by the Imperial Parliament to extend to that colony. This had the dual effect of granting colonies autonomy within their borders while subordinating them to the British Parliament otherwise.
Most of the remaining colonies in North America – everything north of the United States with the exception of Newfoundland – were merged into a federal polity known as "Canada" in the late 1860s and early 1870s. Canada was termed a "dominion", a term previously used in slightly different contexts in English history, and granted a broad array of powers between the federal government and the provincial governments. Australia was similarly deemed a dominion when it federated in 1901, as were Newfoundland, New Zealand, South Africa, and the Irish Free State in the first decades of the 20th century.
Dominions did not possess full sovereignty on an equal footing with the United Kingdom. The parliament of Canada passed a law barring appeals from its Supreme Court to the imperial Judicial Committee of the Privy Council in 1888, but in 1925 a judgement of the Privy Council determined that this law was invalid. Combined with the King–Byng affair the following year, this bred resentment in Canada and led to its insistence on full sovereignty. The leadership of the Irish Free State, meanwhile, was dominated by those who had fought a war of independence against Britain and who had agreed to dominion status as a compromise; they took a maximalist view of the autonomy they had secured in the Anglo-Irish Treaty and pushed for recognition of their state's sovereignty, which would have implications for the other dominions as well. The 1926 Imperial Conference led to the Balfour declaration that dominions were equal in status to one another and to the United Kingdom. Further conferences in 1929 and 1930 worked out a substantive framework to implement this declaration. This became the Statute of Westminster 1931.
Application
The Statute of Westminster gave effect to certain political resolutions passed by the Imperial Conferences of 1926 and 1930; in particular, the Balfour Declaration of 1926. The main effect was the removal of the ability of the British parliament to legislate for the Dominions, part of which also required the repeal of the Colonial Laws Validity Act 1865 in its application to the Dominions. King George V expressed his desire that the laws of royal succession be exempt from the statute's provisions, but it was determined that this would be contrary to the principles of equality set out in the Balfour Declaration. Both Canada and the Irish Free State pushed for the ability to amend the succession laws themselves and section 2(2) (allowing a Dominion to amend or repeal laws of paramount force, such as the succession laws, insofar as they are part of the law of that Dominion) was included in the Statute of Westminster at Canada's insistence. After the statute was passed, the British parliament could no longer make laws for the Dominions, other than with the request and consent of the government of that Dominion.
The statute provides in section 4:
No Act of Parliament of the United Kingdom passed after the commencement of this Act shall extend, or be deemed to extend, to a Dominion as part of the law of that Dominion, unless it is expressly declared in that Act that that Dominion has requested, and consented to, the enactment thereof.
It also provides in section 2(1):
No law and no provision of any law made after the commencement of this Act by the Parliament of a Dominion shall be void or inoperative on the ground that it is repugnant to the Law of England, or to the provisions of any existing or future Act of Parliament of the United Kingdom, or to any order, rule or regulation made under any such Act, and the powers of the Parliament of a Dominion shall include the power to repeal or amend any such Act, order, rule or regulation in so far as the same is part of the law of the Dominion.
The whole statute applied to the Dominion of Canada, the Irish Free State, and the Union of South Africa without the need for any acts of ratification; the governments of those countries gave their consent to the application of the law to their respective jurisdictions. Section 10 of the statute provided that sections 2 to 6 would apply in the other three Dominions —Australia, New Zealand, and Newfoundland – only after the respective parliament of that Dominion had legislated to adopt them.
Since 1931, over a dozen new Commonwealth realms have been created, all of which now hold the same powers as the United Kingdom, Canada, Australia, and New Zealand over matters of change to the monarchy, though the Statute of Westminster is not part of their laws. Ireland and South Africa are now republics and Newfoundland is now part of Canada as a province.
Australia
Australia adopted sections 2 to 6 of the Statute of Westminster with the Statute of Westminster Adoption Act 1942, in order to clarify the validity of certain Australian legislation relating to the Second World War; the adoption was backdated to 3 September 1939, the date that Britain and Australia joined the war.
Adopting section 2 of the statute clarified that the Parliament of Australia was able to legislate inconsistently with British legislation, adopting section 3 clarified that it could legislate with extraterritorial effect. Adopting section 4 clarified that Britain could legislate with effect on Australia as a whole only with Australia's request and consent.
Nonetheless, under section 9 of the statute, on matters not within Commonwealth power Britain could still legislate with effect in all or any of the Australian states, without the agreement of the Commonwealth although only to the extent of "the constitutional practice existing before the commencement" of the statute. However, this capacity had never been used. In particular, it was not used to implement the result of the 1933 Western Australian secession referendum, as it did not have the support of the Australian government.
All British power to legislate with effect in Australia ended with the Australia Act 1986, the British version of which says that it was passed with the request and consent of the Australian Parliament, which had obtained the concurrence of the parliaments of the Australian states.
Canada
This statute limited the legislative authority of the British parliament over Canada. It effectively gave the country legal autonomy as a self-governing Dominion, though the British parliament retained the power to amend Canada's constitution, a provision which was requested by Canada while a new amending formula was discussed internally. That authority remained in effect until the Constitution Act, 1982, which transferred it to Canada, the final step to achieving full sovereignty.
The British North America Acts—the written elements (in 1931) of the Canadian constitution—were excluded from the application of the statute because of disagreements between the Canadian provinces and the federal government over how the British North America Acts could be otherwise amended. These disagreements were resolved only in time for the passage of the Canada Act 1982, thus completing the patriation of the Canadian constitution to Canada.
At that time, the Parliament of the United Kingdom also repealed ss 4 and 7(1) of the Statute of Westminster as applied to Canada. The Statute of Westminster, as amended, remains a part of the constitution of Canada by virtue of section 52(2)(b) of and the schedule to the Constitution Act, 1982. The Newfoundland Terms of Union expressly provide for the application of the Statute of Westminster to the province of Newfoundland and Labrador.
As a consequence of the statute's adoption, the Parliament of Canada gained the ability to abolish appeals to the Judicial Committee of the Privy Council. Criminal appeals were abolished in 1933, while civil appeals continued until 1949. The passage of the Statute of Westminster meant that changes in British legislation governing the succession to the throne no longer automatically applied to Canada.
Irish Free State
The Irish Free State never formally adopted the Statute of Westminster, its Executive Council (cabinet) taking the view that the Anglo-Irish Treaty of 1921 had already ended Westminster's right to legislate for the Irish Free State. The Free State's constitution gave the Oireachtas "sole and exclusive power of making laws". Hence, even before 1931, the Irish Free State did not arrest deserters from the British Army and Royal Air Force on its territory, even though the UK believed post-1922 British laws gave the Free State's Garda Síochána the power to do so. The UK's Irish Free State Constitution Act 1922 said, however, "[n]othing in the [Free State] Constitution shall be construed as prejudicing the power of [the British] Parliament to make laws affecting the Irish Free State in any case where, in accordance with constitutional practice, Parliament would make laws affecting other self-governing Dominions". In 1924, Kevin O'Higgins, the Free State's Vice-President of the Executive Council, declared that "Ireland secured by that 'surrender' [the Treaty] a constitutional status equal to that of Canada. 'Canada,' said the late Mr. Bonar Law,' is by the full admission of British statesmen equal in status to Great Britain and as free as Great Britain'. The constitutional status of Ireland, therefore, as determined by the Treaty of 1921, is a status of co-equality with Britain within the British Commonwealth. The second Article of the Constitution of the Free State", he added, "declares that 'All powers of Government and all authority, legislative, executive and judicial, in Ireland are derived from the people of Ireland' ".