Founded on 12 April 2018 as an electoral alliance between three political parties – DaB, DSB and the Green Movement,[8] it merged into PP-DB in 2023.

[11][12] In its manifesto, the union set out its main goals, including to be an alternative to the current government and to consolidate Bulgaria's democratic values and Euro-Atlantic choices.

[20] The candidate of Democrats for a Strong Bulgaria for the European elections Svetoslav Malinov was selected through a resolution during the party's National Congress on 12 November 2018.

[21] On February 22, 2019, The Greens announced their primary candidate for the elections – Albena Simeonova – an environmentalist and entrepreneur in the sphere of bio agriculture.

[22] Democratic Bulgaria eventually won one seat in the 2019 European Parliament election, which went to DSB member Radan Kanev.

[25] The results were seen as a serious setback for the ruling party GERB, which had until then maintained a strong hold on the capital, winning 23 out of 25 districts in 2015.