The UDSG was established on 9 September 1947 by Jean-Hilaire Aubame,[1] and was affiliated with the African Regroupment Party.
Although the UDSG was the largest party, the Gabonese Democratic Bloc-led coalition gained a majority of seats.
The party formed an alliance with the BDG for the 1961 general elections.
The BDG's Léon M'ba was the sole presidential candidate and the two parties put forward a joint list for the National Assembly elections.
The party did not contest the 1967 general elections, and the country became a one-party state in 1968.