[5] The party, promoted by former members of the extinct Democratic Union of Catalonia (UDC), was publicly presented in Barcelona on 19 June 2017.

[4] In its founding congress held in October 2017, the party proposed forming an electoral platform together with the Socialists' Party of Catalonia (PSC) and other actors from moderate Catalanism opposed to Catalan independence.

[6] Units reached an electoral agreement with the PSC ahead of the 2017 Catalan regional election, under which party leader Ramon Espadaler would run as the list's third candidate for the Barcelona constituency.

[9] The party renewed their alliance with the PSC for of the upcoming 2019 Spanish local elections.

[10][11] Concurrently, it joined the Coalition for a Solidary Europe alliance together with the Basque Nationalist Party (PNV), Canarian Coalition (CCa) and other regionalist political parties in Spain ahead of the 2019 European Parliament election.