 A referendum approved the current constitution in July 1991.The "Parti Républicain Démocratique et Social" (PRDS), led by President Maaouya Ould Sid'Ahmed Taya, has dominated Mauritanian politics since the country's first multi-party elections in April 1992 following the approval by referendum of the current constitution in July 1991.President Taya, who won elections in 1992 and 1997, first became chief of state through a December 12, 1984 bloodless coup which made him chairman of the committee of military officers that governed Mauritania from July 1978 to April 1992.