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With the development of the modern British Commonwealth of Nations in the 20th century, some deemed the single Imperial status of British subject as increasingly inadequate to deal with the realities of a Commonwealth with independent member states.
In 1931, with the final approval by the Imperial Parliament's (including the House of Lords and House of Commons sitting in London) legislating on behalf of dominions and other territories of the British Empire, and later British Commonwealth of Nations, for the ratification of the "Statute of Westminster of 1931", the United Kingdom ceased to have legislative control over Canada.
The Statute of Westminster 1931, which transformed the British Empire into the British Commonwealth of Nations, is sometimes referred to (particularly in the former dominions) as a "Treaty" of Westminster