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
Territorial evolution of Switzerland Territorial evolution of Switzerland The territorial evolution of Switzerland occurred primarily with the acquisition of territory by the historical cantons of the Old Swiss Confederacy and its close associates. This gradual expansion took place in two phases, the growth from the medieval Founding Cantions to the "Eight Cantons" during 1332–1353, and the expansion to the "Thirteen Cantons" of the Reformation period during 1481–1513. The Helvetic Republic (formed 1798) as revised in the Act of Mediation (1803) added further territories of former Associates of the Swiss Confederacy, notably those of the Abbey of St. Gall and the Three Leagues. The territories