unanimous among all member countries. In 1919, women were successful in lobbying for foreign women to be able to naturalise independently of their spouse in Canada, but by law they were still required to have the same nationality as their husband in the empire. A separate status of "Canadian national" was created under the Canadian Nationals Act, 1921, which was defined as being any British subject who was a Canadian citizen as defined above, the wife of any such citizen, and any person born outside Canada whose father was a Canadian national at the time of that person's birth. Canada later passed the Chinese Immigration Act, 1923 on June 30, 1923, which barred Chinese immigration except for a very restricted group of diplomats, merchants, missionaries, students and returning residents. In 1928, the Japanese government agreed to amend their emigration agreement, limiting immigration to Canada to 150 persons annually. After the World Conference on the Codification of International Law held in The Hague in 1930, Canada became the first Commonwealth country to modify its laws to conform with the provisions to prevent statelessness in the Convention on Certain Questions Relating to the Conflict of Nationality Laws. In 1931, under the government of R. B. Bennett the Nationality Act was reformed to prevent women from losing their nationality through marriage if they would be rendered stateless. The amendment also introduced the concept of consent, meaning that alien women did not automatically derive the nationality of a spouse, but could obtain his nationality if they requested it within six months of his change of status. Once ratified, the 1931 Statute of Westminster gave the Dominions the ability to govern independently on behalf of their constituents, rather than implementing governance on behalf of the British crown. This allowed Commonwealth members to define members of their own communities separately from that which defined British subjects, opening the door to nationality in member states of the realm. Because of this Canadians, and others living in countries that became known as Commonwealth realms, were known as subjects of the Crown. However in legal documents the term "British subject" continued to be used. Prior to 1947, Canada issued two types of passports: those to British subjects by birth (coloured blue), and those to naturalized British subjects or citizens (coloured red). Eligibility of married women There were complex rules for determining whether married women qualified as British subjects. Until