During 2017 there were lengthy talks on the creation of an electoral list to the left of the Democratic Party (PD), within the PD-led centre-left coalition.

In this process Giuliano Pisapia, a former mayor of Milan, launched the Progressive Camp (CP) and long pondered the possibility of leading the proposed list, including minor established parties, assorted leftists and, most notably, former members of Left Ecology Freedom (SEL) – which had been folded into the more radical Italian Left (SI).

In December, after Pisapia's retirement and the dissolution of the CP, Riccardo Nencini, Angelo Bonelli and Giulio Santagata, respectively leaders of the Italian Socialist Party (PSI), the Federation of the Greens (FdV) and Civic Area (AC), launched Together in order to participate in the 2018 general election as a part of the centre-left coalition, along with More Europe (+E) and the Popular Civic List (CP).

Together's logo was styled on that of The Olive Tree, a broad centre-left coalition active from 1995 to 2007 (when its main components were merged into the PD).

However, two of its members elected in single-seat constituencies: Nencini (PSI) to the Senate in Arezzo and Serse Soverini (AC) to the Chamber in Imola.