Centrists like Marchiori, Panizza and Rossi supported the centre-left coalition with the Democratic Party and the Union for Trentino in 2002–2018.

Andreotti, Franco Tretter, Giacomo Bezzi and, lately, Walter Kaswalder, expelled in 2017, held a more conservative (and traditional) position, that resonated well with the party's grassroots.

In the 1998 provincial election, the PATT's share of the vote declined to 12.4%, due to the presence of AI (3.8%) and, especially, the success of the newly formed Daisy Civic List (22.2%).

AI entered in coalition with the Daisy, while the PATT formed an alliance with the House of Freedoms and, primarily, Lega Nord Trentino (LNT) for the 2001 general election: under this arrangement, Giacomo Bezzi stood as candidate in the single-seat-constituency of Lavis, but was narrowly defeated.

Consequently, Andreotti was appointed president of Trentino-Alto Adige/Südtirol at the head of a coalition comprising the SVP, the Daisy, the Democrats of the Left and the Greens.

In 2001, the PATT underwent the split of the Trentino Autonomists – Gentians (Italian: Autonomisti Trentini – Genziane), that appointed Dario Pallaoro and Renzo Foladori respectively as its president and secretary.

[11] Also, would-be senator Muraro did not rule out the possibility of an alliance with the centre-right, if Silvio Berlusconi would have become Prime Minister again.

Following the election, Rossi formed an eight-member strong government, including three ministers of the PD, two of the UpT, one of the PATT (Michele Dallapiccola) and one independent (Carlo Daldoss).

[46][47][48][49] A new congress was scheduled in June:[50] Ottobre wanted to run again, this time with Pedergnana's and Corona's support,[51][52][53] but he finally decided to leave the party altogether.

[58][59][60][61][62] Kaswalder launched the Popular Autonomists (AP),[63][64] while Tamanini resigned from president, being replaced by Federico Masera, and from the party itself.

[68][69] In the run-up of the 2018 provincial election, the autonomist centre-left broke up, as both the PD and the UpT were no longer willing to support Rossi as candidate for president.

[78] For the 2019 European Parliament election, the SVP and the PATT formed a technical alliance with fellow EPP member party FI, after negotiations with the PD had failed.

[79] In 2021, PATT's Lorenzo Ossanna joined the regional government, including the SVP, the LNT and Forza Italia (FI).

Rossi was briefly a member of Action,[81] while the latter two formed Autonomy House (CA), aligned with the centre-left,[82][83] leaving Ossanna as the party lone provincial councillor.

[87] In the run-up of the 2023 provincial election, the PATT finally decided to support incumbent president Fugatti, thus forming a regionalist/centre-right coalition.

[88] In this context, in July, it was announced that the PATT would form a joint list with the Popular Autonomists (AP) and Trentino Project (PT).

[92] After the election, tensions grew among the three partners,[93][94] but finally the PATT changed its statute in order to allow the members of the other two parties to participate in its upcoming congress.

[97] In February 2025 the PATT finally held its long-awaited congress, without the participation of Kaswalder and Mario Tonina of the PT, which was however represented by its leader Silvano Grisenti, a supporter of Marchiori;[98][99] also Vanessa Masè of Civica was present.