word | | Constitution |
| approved | Spain | approved by legislature 31 October 1978; passed by referendum 6 December 1978; signed by the king 27 December 1978 |
| approved | Switzerland | revision of Constitution of 1874 approved by the Federal Parliament 18 December 1998, adopted by referendum 18 April 1999, officially entered into force 1 January 2000 |
| April | Algeria | 8 September 1963; revised 19 November 1976; effective 22 November 1976; revised 3 November 1988, 23 February 1989, 28 November 1996, 10 April 2002, and 12 November 2008 |
| April | Andorra | Andorra's first written constitution was drafted in 1991; approved by referendum 14 March 1993; effective 28 April 1993 |
| April | Anguilla | Anguilla Constitutional Order 1 April 1982; amended 1990 |
| April | Cameroon | approved by referendum 20 May 1972; adopted 2 June 1972; revised January 1996; amended April 2008 |
| April | Canada | ... 29 March 1867, which created a federation of four provinces, and the Constitution Act of 17 April 1982, which transferred formal control over the constitution from Britain to Canada, and added a ... |
| April | Ghana | approved 28 April 1992 |
| April | Greece | 11 June 1975; amended March 1986 and April 2001 |
| April | Hungary | 25 April 2011, effective 1 January 2012 |
| April | Kosovo | adopted by the Kosovo Assembly 9 April 2008; effective 15 June 2008 |
| April | Lesotho | 2 April 1993 |
| April | Monaco | 17 December 1962; modified 2 April 2002 |
| April | Nepal | 15 January 2007 (interim Constitution); note - in April 2008, a Constituent Assembly was elected to draft and promulgate a new constitution by May 2010; the fourth and final deadline extended to May ... |
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