British subject (short-lived) incorporation of Singapore within Malaysia between 1963 and 1965. Similar arrangements also existed for the other states and colonies that made make up the Federation of Malaya from 1948: they too introduced citizenship statuses (which eventually became Malayan and later Malaysian citizenship) before achieving independence in 1957. In most other Commonwealth countries, the term Commonwealth citizen was used instead of British subject. On 1 January 1983, upon the coming into force of the "British Nationality Act" 1981, every citizen of the United Kingdom and colonies became either a British citizen, British Dependent Territories citizen or British Overseas citizen. Use
Federation in practice highly centralized under the government of the Soviet Union. The Russian Federation has inherited a similar system. Nigeria, Pakistan, India and Malaysia became federations on or shortly before becoming independent from the British Empire. In some recent cases, federations have been instituted as a measure to handle ethnic conflict within a state, such as Bosnia and Herzegovina, and Iraq since 2005. With the United States Constitution having become effective on 4 March 1789, the United States is the oldest surviving federation. On the other end of the timeline is Nepal, which became the newest federation after its constitution