The leading members of the Social Democratic Party decided however to proclaim the republic the day after, and on November 1, 1918, Otto Roth proclaimed the Republic of Banat from the balcony of the Timişoara local council. The civil leader of the Republic was Dr Roth while the military commander was Albert Barta. The Government of Hungary recognized the independence of the Banat Republic.
The same day the founding meeting of the Banat People's Council took place with 20 members from the city council, 60 members from the military national councils, 40 representatives from the workers councils and 70 from the bourgeois parties. Then an Executive committee of 20 members was elected.
The authority of the People's Council was however not respected because the Romanian ethnic plurality didn't want autonomy without the realisation of their national aspiration, unification with Romania.
The Banat National Council organized military squads and a civil guard (on November 4), with a goal to establish control over the entire territory of the Banat. However, the Banat Republic was to be a short-lived state and this goal was not achieved. On November 15, 1918, Serbian troops entered the Banat and put an end to the Republic. The national councils were dismantled by the Serbian forces on February 21, 1919. A few months later, following the Alba-Iulia Resolution and Great People's Assembly in Novi Sad, the Banat region was divided primarily between Romania and the Kingdom of Serbs, Croats and Slovenes (later renamed to Yugoslavia).
On April 16, 1920, ethnic Germans from the Banat sent a request to the Paris Peace Conference asking for the re-establishment of the Republic under the name of the Republic of Banatia. According to the request, this new republic would include not only the Banat, but also the neighbouring region of Bačka. The republic would be divided into cantons, each administered by the plurality or the majority ethnic group. However, the Peace Conference rejected this proposal.
The population of the Republic was 1,582,133, of which 592,049 (37.42%) were Romanians, 387,545 (24.50%) Germans, 284,329 (17.97%) Serbs, and 242,152 (15.31%) Hungarians, with smaller numbers of other ethnic groups such as the Slovaks, Croats, Banat Bulgarians and Rusyns. The religious composition was as follows: 855,852 (54.10%) were Orthodox Christians, 591,447 (37.38%) were Roman Catholics, with a scattering of adherents of other religious groups such as Calvinists, Lutherans and Jews.