Former canton, central Switzerland. It was ruled after 1173 by the Habsburg counts. In 1291, with Uri and Schwyz, it formed the Everlasting League, which became the nucleus of the Swiss Confederation. In 1340 it divided into two sovereign half cantons, Nidwalden and Obwalden; in 1803 they became demicantons having equal rights.
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Unterwalden was one of the three participants in the 1291 alliance with Uri and Schwyz, considered the origin of the Swiss Confederation.