Saint Pierre and Miquelon:
28 September 1958 (French Constitution)
Saint Vincent and the Grenadines:
27 October 1979
Samoa:
1 January 1962
San Marino:
8 October 1600; electoral law of 1926 serves some of the
functions of a constitution
Sao Tome and Principe:
approved March 1990; effective 10 September
1990
Saudi Arabia:
governed according to Shari'a (Islamic law); the Basic
Law that articulates the government's rights and responsibilities
was introduced in 1993
Senegal:
3 March 1963, revised 1991
Seychelles:
18 June 1993
Sierra Leone:
1 October 1991; subsequently amended several times
Singapore:
3 June 1959, amended 1965 (based on preindependence State
of Singapore Constitution)