In March 1968, Bongo declared Gabon a one-party state by dissolving the BDG and establishing a new party—the Parti Democratique Gabonais (PDG). He invited all Gabonese, regardless of previous political affiliation, to participate. Bongo sought to forge a single national movement in support of the government's development policies, using the PDG as a tool to submerge the regional and tribal rivalries that had divided Gabonese politics in the past. Bongo was elected president in February 1975; in April 1975, the position of vice president was abolished and replaced by the position of prime minister, who had no right to automatic succession. Bongo was re-elected President in both December 1979 and November 1986 to 7-year terms.