After the invasion of the Sixth Coalition into Switzerland on 29 December 1813, the Act of Mediation lost its power. While the neighbouring cantons of Schwyz and Nidwalden wanted to return to the organization of the Old Swiss Confederation, Uri was part of the Zurich-led party, which sought to reorganize the 19 cantons created by the Act. Uri also attempted, unsuccessful, to reincorporate the Leventina valley, but was only able to receive the rights to one-half of the taxes on all trade over Monte Piottino into the Leventina. On 5 May 1815 the "Landsgemeinde" approved the federal constitution. Uri then mediated between the Tagsatzung and Nidwalden, which had refused to recognize the treaty.