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In page British subject:

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Because each country now defined British subject in separate pieces of legislation and these definitions were not always updated or kept at parity, individuals could have been British subjects in one country at a given time but not another. For example, a South African citizen in 1967 would have been considered a British subject in Canada, but not the United Kingdom or South Africa. The country was included in the list of Commonwealth nations in Canadian law,[21] despite South Africa having left the Commonwealth in 1961 and not rejoining it until 1994.[22]