The word 'Canadian' as a term of nationalism or citizenship was first used under the "Immigration Act, 1910", to designate those British subjects who were domiciled in Canada, whereas all other British subjects required permission to land. A separate status of "Canadian national" was created under the "Canadian Nationals Act, 1921", which would broaden the definition of 'Canadian' to include such citizen's wife and children (fathered by the citizen) who had not yet landed in Canada. After the passage of the Statute of Westminster in 1931, the monarchy ceased to be an exclusively British institution. Thus, Canadians—as well as all others living among what is known today as the Commonwealth realms—were regarded as "subjects of the Crown". However, in legal documents, the term 'British subject' continued to be used, hence 'Canadians' were still, officially, British subjects born or regularly domiciled in Canada.