Early years The UV was founded by Valdostan elements of the
Italian resistance movement on 3 September 1945. 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). After that, the party distanced itself from the DC, while approaching the left-wing. Rollandin was thus sworn in as new President of the Region. Contextually, UV's
Antonio Fosson had been elected to the Senate for the regionalist coalition: Fosson joined the
For the Autonomies group and abstained from the vote of confidence on
Silvio Berlusconi's
government. Both in the
2009 European Parliament election and the 2010 Aosta municipal election the UV formed an alliance with Berlusconi's new political party,
The People of Freedom (PdL). In the
2013 general election UV's Albert Lanièce was elected to the Senate with support from the PdL. That alliance was however short-lived and the UV would soon re-join its traditional centre-left partners. In the
2013 regional election, the UV, which had suffered the split of the new
Progressive Valdostan Union (UVP), obtained 33.5% of the vote (–10.9pp from 2008) and 13 seats, and the regionalist coalition retained a narrow majority in the Regional Council. Rollandin was the most voted politician with 10,872 preference votes (2,964 less than five years before) and was re-elected president. In July 2015, the government was enlarged to the centre-left
Democratic Party (PD). In June 2016, after months of negotiations, the government was joined also by the UVP. In November 2016, two regional councillors, including former senator Fosson, left the party in disagreement with Rollandin and launched
For Our Valley (PNV). In March 2017 the UVP, SA (which had suffered the split of the
Valdostan Autonomist Popular Edelweiss (EPAV), PNV and
Autonomy Liberty Participation Ecology (ALPE) formed a new government without the UV, under President
Pierluigi Marquis (SA). In October Marquis resigned and was replaced by
Laurent Viérin (UVP) at the head of a coalition composed of the UV, the UVP, the EPAV and the PD.
Centre-left coalition 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
2018 regional election the UV did even worse, obtaining 19.2% of the vote (–14.3pp from 2013) and seven seats: its worst result in 45 years. After the election, the Regional Council elected
Nicoletta Spelgatti of
Lega Nord Vallée d'Aoste (LNVdA) as President, at the head of a broad left-right coalition (including one defector from UV's ranks, outgoing regional minister Emily Rini), and the UV was once again excluded from the regional government. However, in December the government fell down and was replaced by a new one led by
Antonio Fosson (ex UV, then PNV), at the head of a coalition composed of the UV, the UVP, ALPE, SA and PNV. In December 2019 Fosson resigned from President and was replaced by his Vice President, UV's
Renzo Testolin, as acting president. 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. A few months later, the party also suffered the split by former President Rollandin and his followers, who formed
For Autonomy (PlA). In the
2020 regional election, the UV was reduced to 15.8%, its second worst result ever, while the LNVdA came a stronger first. However, after the election, UV leader
Erik Lavévaz formed a government composed of the PD,
Civic Network (RC), the
Valdostan Alliance (AV, formed by the merger of ALPE and UVP), SA and
Mouv'. Within a year, AV and Mouv' joined forces, while the RC-led
Progressive Civic Project (PCP) left the government. In 2023 Testolin formed a new government, which, differently from Lavévaz's, comprised also PlA.
Réunion and centre-right coalition In late 2023, AV and Mouv' started a merging process into the UV. In June 2024, at an extraordinary congress, the reunion was approved and
Joël Farcoz was elected president. In the
2025 regional election the UV, which also formed a pact with
Sovereign Aosta Country, won 32.0% of the vote. After the election, Testolin formed a new government, composed of the UV, the
Autonomists of the Centre (AdC) – including SA, the
Valdostan Rally (RV) and
Action, but not PlA – and
Forza Italia (FI). ==Electoral results==