Flags and arms of cantons of Switzerland there is overlap; Unterwalden and Solothurn share the same colours, as do Basel and Appenzell, and with the accession of the modern cantons, Valais and Basel-City, and St. Gallen and Thurgau. Of the 26 cantons since 1999 (22 cantons in 1848, accession of Jura in 1979, three half-cantons designated "canton" in 1999): Distinctively, Swiss cantons use square flags. Historically, the number of cantons was: Nidwalden and Obwalden form traditional subdivisions of Unterwalden. Basel-Stadt and Basel-Landschaft, as well as Appenzell Inner- and Ausserrhoden, are half cantons, resulting from the division of Basel and Appenzell, respectively. The Swiss Federal Constitution of 1999
Cantons of Switzerland this form of legislature has declined: at present it exists only in the cantons of Appenzell Innerrhoden and Glarus. The cantonal executives consist of either five or seven members, depending on the canton. For the names of the institutions, see the list of cantonal executives and list of cantonal legislatures. The cantons retain all powers and competencies not delegated to the Confederation by the federal constitution or law: most significantly the cantons are responsible for healthcare, welfare, law enforcement, public education, and also the power of taxation. Each canton defines its official language(s). Cantons may conclude treaties not only with