original_state,original_name,counted_as,state_from,state_to,counted_from,justification,source,flag
"Germany, West",West Germany,Germany,1949-05-23,1990-10-02,,"Reunification was East Germany's accession to the Federal Republic, so today's Germany is the same state as West Germany.","Wikipedia (English), German reunification: the reunited state ""is not a successor state, but an enlarged continuation of the 1949–1990 West German state"".",
Malaya,Federation of Malaya,Malaysia,1957-08-31,1963-09-16,,"Malaysia is the Federation of Malaya, renamed and enlarged in 1963 with North Borneo, Sarawak and Singapore.","Wikipedia (English), Member states of the United Nations, Malaysia (admitted 17 September 1957): ""Name was changed from Federation of Malaya on 16 September 1963""; Federation of Malaya: ""the Federation was reconstituted as Malaysia"".",
"Vietnam, North",North Vietnam,Vietnam,1945-09-02,1976-07-02,,"The Socialist Republic of Vietnam took North Vietnam's constitution, flag and anthem in 1976. South Vietnam is not mapped.","Wikipedia (English), North Vietnam: North and South were ""officially reunited on 2 July 1976 as the Socialist Republic of Vietnam"", which ""adopted the North Vietnamese constitution, flag and anthem"".","Uncertain continuity: Wikipedia describes 1976 as a merger that formed a new state, not as a renaming of North Vietnam, and Vietnam joined the UN as a new member in 1977. Mapped by the decision of 31 October 2026."
Serbia and Montenegro,Federal Republic of Yugoslavia / Serbia and Montenegro,,1992-04-27,2006-06-05,,"Not counted. The federation's own presidents and prime ministers are not assigned to either republic, although Serbia continued its UN membership; from 27 April 1992 Serbia's and Montenegro's own republic leaders count instead.","Wikipedia (English), Member states of the United Nations: ""the membership of Serbia and Montenegro in the UN was being continued by Serbia"".",
United Arab Republic,United Arab Republic,Egypt,1958-02-01,1961-09-28,,"The 1958–1961 union of Egypt and Syria, led by Egypt's president. Egypt kept the union's name until 1971 and its UN seat; Syria resumed separate membership.","Wikipedia (English), United Arab Republic: ""Egypt continued to be known officially as the United Arab Republic until it was formally dissolved"" in 1971; Member states of the United Nations: Syria ""resumed its separate membership in the UN"".","Territory: the union also governed Syria; its leader, Gamal Abdel Nasser, counts only under Egypt."
Taiwan,Republic of China,Taiwan,,,1949-12-07,"Geographical convention, not a statement about sovereignty: the dataset files the Republic of China under Taiwan for the whole century, and the story counts it there only once its government was based in Taiwan. Its mainland years stay in the dataset but are not shown; the People's Republic counts as China from October 1949.","Wikipedia (English), Retreat of the government of the Republic of China to Taiwan: the government ""retreated to the island of Taiwan (Formosa) on December 7, 1949"".","Convention: China's and Taiwan's plots are empty before 1949, although the Republic of China governed the mainland."
Soviet Union,Soviet Union,,,1991-12-26,,"Not counted. Russia continued the Soviet Union's UN seat, but the Soviet Union's leaders governed a union of 15 republics, so they are not assigned to any one of them.",,
Yugoslavia,Socialist Federal Republic of Yugoslavia,,,1992-04-27,,"Not counted. The Socialist Federal Republic of Yugoslavia's leaders governed six republics and are not assigned to Serbia or any other successor; the leaders of its republics are outside the project's scope until 27 April 1992, when it ended.",,
"Germany, East",East Germany,,1949-10-07,1990-10-02,,Not counted: a dissolved state that acceded to the Federal Republic.,,
"Vietnam, South",South Vietnam,,1949-07-02,1976-07-02,,Not counted: a dissolved state.,,
Czechoslovakia,Czechoslovakia,,,1992-12-31,,Not counted: dissolved into the Czech Republic and Slovakia.,,
"Yemen, North",North Yemen,,,1990-05-22,,"Not counted: unified with South Yemen as a new state, Yemen.",,
"Yemen, South",South Yemen,,1967-11-30,1990-05-22,,"Not counted: unified with North Yemen as a new state, Yemen.",,
Serbia,"Republic of Serbia within the FR Yugoslavia, later Serbia and Montenegro",Serbia,2006-06-05,,1992-04-27,"A comparison rule, not the date of independence (5 June 2006): before 27 April 1992 the leaders of the SFR Yugoslavia's constituent republics are left out; from that day, when the SFR Yugoslavia ended, Serbia's own republic presidents and prime ministers count, including acting holders during a vacancy, and the federation's do not. A term that began earlier counts from that day.","Wikipedia (English), List of presidents of Serbia and Prime Minister of Serbia, and each holder's own article; checked against predsednik.rs 'Na čelu Srbije', srbija.gov.rs 'Vlade Republike Srbije od 1990. godine do danas' and worldstatesmen.org 'Serbia'.","Sources differ on acting presidents in 2004: worldstatesmen.org has Velimir Simonović, the assembly's chair by age, from 27 January to 4 February 2004, and predsednik.rs runs Nataša Mićić's acting term to 4 February 2004; no English Wikipedia page names Simonović acting president, so he is not added, and Mićić's term ends on 27 January 2004 as her own article gives it. In 2004–2006 the federal president, Svetozar Marović, is not counted for Serbia."
Montenegro,"Republic of Montenegro within the FR Yugoslavia, later Serbia and Montenegro",Montenegro,2006-06-03,,1992-04-27,"A comparison rule, not the date of independence (3 June 2006): before 27 April 1992 the leaders of the SFR Yugoslavia's constituent republics are left out; from that day, when the SFR Yugoslavia ended, Montenegro's own republic presidents and prime ministers count, including acting holders during a vacancy, and the federation's do not. A term that began earlier counts from that day.","Wikipedia (English), List of presidents of Montenegro and Prime Minister of Montenegro, and each holder's own article; checked against worldstatesmen.org 'Montenegro'.","Dragan Đurović only chaired government sessions from 5 November 2002 to 8 January 2003 (his article), while Filip Vujanović was still prime minister until 8 January 2003 (his article's text and the list), so Đurović is a stand-in and not counted. Momir Bulatović's term until 28 April 1992 was as President of the Presidency, then as President."