[1] One of its leading members, Renzo Testolin, has been the President of Aosta Valley since March 2023, replacing Erik Lavévaz, also of the UV.

The party re-groups most Valdostan autonomists under its banner and steadily increased its share of vote from 11.6% in 1973 to 47.2% in 2003, which was followed by a decline and splits.

The party was originally a close ally of the Christian Democracy (DC), with which it shared government between 1946 and 1954 under Severino Caveri (UV).

This caused the split of UV's conservative faction, which established the Valdostan Rally (RV), in order to support the coalition led by DC's Cesare Bondaz.

In the 1978 regional election the UV returned to be the largest party with 24.7% of the vote and Andrione formed a government with the DC and the DP.

In 1984 Andrione was replaced by Augusto Rollandin at the head of the government, which included the DC and the Progressive Democratic Autonomists (ADP), born by the merger of the DP and the UVP.

Despite its ties with the parties of the centre-left, the UV contested the 2006 general election in competition with The Union (rallied in the Autonomy Liberty Democracy list), as part of the regionalist coalition named Aosta Valley, causing the split of the Valdostan Renewal (RV), but lost and was no more represented in Parliament.

[19][20] In November 2016, two regional councillors, including former senator Fosson, left the party in disagreement with Rollandin and launched For Our Valley (PNV).

[26] In the 2018 general election, Lanièce was narrowly re-elected to the Senate, but the four-party coalition forming the regional government lost several votes and the seat in the Chamber.

In the 2019 European Parliament election the UV was part of a five-party regionalist joint list, which had a technical agreement with the PD and obtained a mere 13.9% of the vote.