The Balfour Declaration of 1926 provided the Dominions the right to be considered equal to Britain, rather than subordinate; an agreement that had the result of, in theory, a shared Crown that operates independently in each realm rather than a unitary British Crown under which all the Dominions were secondary. The Monarchy thus ceased to be an exclusively British institution, although it has often been called "British" since (in both legal and common language) for reasons historical, legal, and of convenience. The Royal and Parliamentary Titles Act, 1927 was the first indication of this shift in law, further elaborated in the Statute of Westminster, 1931.