The Mauritanian National Union (French: Union nationale mauritanienne, abbreviated UNM) was a political party in Mauritania. The party was founded in April 1959, as a merger between a dissident group in the Mauritanian Regroupment Party (PRM) and the Union of Natives of Southern Mauritania (UOMS).[1][2][3] The foundation of the party took place in the run-up to the May 1959 legislative elections.[4] Members of the party bureau of UNM included Hadrami Ould Khatrri (political secretary), Moussa Sall, Yacoub Ould Boumediana (chairman) and Ba Abdoul Aziz (administrative secretary).[4][5][6][7] The UNM favoured unity with the neighbouring states in the Mali Federation.[1][3][8]
The party had most of its support from the Black populations of southern Mauritania.[9] The party could not contest the May 17, 1959 legislative elections, having been formed too soon before the polls.[10][11] The party held its founding conference in July 1959, in Aïoun.[7] At the conference, the party declared itself as 'the Mauritanian section of the Party of the African Federation' (PFA), a move reciprocated in a greeting from the PFA bureau two months later.[7]
In February 1960 Hadrami, Yacoubi and Ba were arrested, charged with conspiring against the integrity of the state.[12][6]
Once the Mali Federation collapsed, the jailed UNM leaders were released.[6] Subsequently the party moved closed to Moktar Ould Daddah.[3][9] The party was pressured to align with PRM and on October 10, 1960 the two parties formed a united front.[11][12][10] At a meeting held on June 30, 1961 leaders of PRM, UNM and the former Nahda agreed to merge their parties.[13] Subsequently, the Mauritanian People's Party (PPM) was formed as the sole legal party in the country.[14]