Japan
3 May 1947 (current constitution adopted as amendment to Meiji
Constitution); notable earlier dates: 660 B.C. (traditional date of
the founding of the nation by Emperor JIMMU); 29 November 1890
(Meiji Constitution provides for constitutional monarchy)
Jersey
none (British crown dependency)
Jordan
25 May 1946 (from League of Nations mandate under British
administration)
Kazakhstan
16 December 1991 (from the Soviet Union)
Kenya
12 December 1963 (from the UK)
Kiribati
12 July 1979 (from the UK)
Korea, North
15 August 1945 (from Japan)
Korea, South
15 August 1945 (from Japan)
Kosovo
17 February 2008 (from Serbia)
Kuwait
19 June 1961 (from the UK)