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 that remains in popular use, the 1999 revision and official terminology since then use the appellation "cantons with half of a cantonal vote". The reasons for the existence of the three pairs of half-cantons are varied: With their original circumstances of partition now a historical matter, the half-cantons are since 1848 equal to the other cantons in all but two respects: Between 1831 and 1833 the canton of Schwyz divided into half-cantons: (Inner) Schwyz and the break-away Outer Schwyz; in this instance the half-cantons were forced by the Confederation to settle their disputes and re-unite. In the 20th century, some