Ури
The 19 municipalities of the Canton of Uri were mentioned in the cantonal constitution and any merger had to be approved by a cantonal referendum that would change the constitution accordingly. A referendum in 2013 approved with 57%, the removal of the names of the 19 municipalities from the constitution, thus allowing municipalities' mergers without the need of a cantonal referendum. The municipalities of Seedorf and Bauen were the first that voluntarily decided to merge. The merger took place on 1 January 2021, after approval by the population of both municipalities in a referendum in October 2019; the population of both Seedorf and Bauen voted in favor of the merger with 80% and 69% respectively