Effectively the government party of Bessarabia in the wake of its formal union with Romania, the PȚB scored a major victory in the 1919 election, when it emerged as the third most popular party in Greater Romania, and an essential partner in government. It was therefore co-opted by the Parliamentary Bloc, formed around the Romanian National Party, until the latter's government was brought down by the People's Party. Although losing several of its chapters before the 1920 elections, it still won Bessarabia by a significant margin, openly embracing the cause of decentralization and regional autonomy.