Arbitrary list of (obscure) nation states that existed during the 20th century.
Internationally Recognised
Ordered to date of dissolution:
- 1982 – 1992: Coalition Government of Democratic Kampuchea
- 1958 – 1984: Republic of Upper Volta
- 1478 – 1967: Ankole
- 1809 – 1949: Tripura
- 1921 - 1931: Socialist Soviet Republic of Abkhazia
- 1920 - 1924: Free State of Fiume
- 22 April 1918 – 28 May 1918: Transcaucasian Democratic Federative Republic
- 1501 - 1912: Wadai Empire
- 1713 - 1904: Kingdom of Champasak
- 1690 - 1902: Aro Confederacy
Not Internationally Recognised
- 1992 - 1995: Republika Srpska
- 1990 - 1994: Gagauz Republic
- 10 January 1919 - 23 February 1923 Free State of Bottleneck
- 10 January 1919 - 4 February 1919 Bremen Soviet Republic
Honorable Mentions/Condominiums
Less obscure, but still worth mentioning:
- 1925 - 1958: Tangier International Zone
- 1947 - 1954: Free Territory of Trieste
- 1907 - 1949: Dominion of Newfoundland
- 1921 - 1944: Tuvan People’s Republic
- 1816 - 1920: Neutral Moresnet