Commonwealth of Nations
Commonwealth republics

On 18 April 1949, Ireland formally became a republic in accordance with the Irish Republic of Ireland Act 1948; in doing so, it also formally left the Commonwealth. Whilst Ireland had not actively participated in the Commonwealth since the early 1930s, other dominions wished to become republics without losing Commonwealth ties. The issue came to a head in April 1949 at a Commonwealth prime ministers' meeting in London. Under the London Declaration, as drafted by V. K. Krishna Menon, India agreed, when it became a republic in January 1950, it would remain in the Commonwealth and accept the British Sovereign as a "symbol of the free association of its independent member nations and as such the Head of the Commonwealth". Upon hearing this, King George VI told Menon: "So, I've become 'as such'". Some other Commonwealth countries that have since become republics have chosen to leave, whilst others, such as Guyana, Mauritius and Dominica, have remained members.

India's inaugural prime minister Jawaharlal Nehru declared on 16 May 1949, shortly following the Declaration, during the Constituent Assembly Debates that:

We join the Commonwealth obviously because we think it is beneficial to us and to certain causes in the world that we wish to advance. The other countries of the Commonwealth want us to remain there because they think it is beneficial to them. It is mutually understood that it is to the advantage of the nations in the Commonwealth and therefore they join. At the same time, it is made perfectly clear that each country is completely free to go its own way; it may be that they may go, sometimes go so far as to break away from the Commonwealth...Otherwise, apart from breaking the evil parts of the association, it is better to keep a co-operative association going which may do good in this world rather than break it.

The London Declaration is often seen as marking the beginning of the modern Commonwealth. Following India's precedent, other nations became republics, or constitutional monarchies with their own monarchs. Whilst some countries retained the same monarch as the United Kingdom, their monarchies developed differently and soon became essentially independent of the British monarchy. The monarch is regarded as a separate legal personality in each realm, even though the same person is monarch of each realm.
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