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| YEAR | DATE | EVENT | PRESIDENT | PRIME MINISTER | GOVERNOR |
| 1903 | 12 may | French Protectorate | Xavier Coppolani | ||
| 1904 | 18 october | Part of French West Africa colony | |||
| 1920 | 12 january | French colony | Nicolas Jules Henri Gaden | ||
| 1920 | 12 january | French colony | Nicolas Jules Henri Gaden | ||
| 1926 | 9 november | Albéric Auguste Fournier | |||
| 1928 | 13 january | Alphonse Paul Albert Choteau | |||
| 1929 | 21 november | René Héctor Émile Chazal | |||
| 1931 | 19 june | Gabriel Omer Descemet (I) | |||
| 1933 | 22 june | Louis François Antonin | |||
| 1934 | 7 april | Gabriel Omer Descemet (II) | |||
| 1934 | 5 july | Adolphe Deitte | |||
| 1934 | august | Jean-Baptiste Victor Chazelas (I) | |||
| 1934 | 1 november | Richard Édmond Maurice Édouard Brunot | |||
| 1935 | 15 april | Jean-Baptiste Victor Chazelas (II) | |||
| 1935 | 10 november | Jules Marcel de Coppet | |||
| 1936 | 1 september | Jean Louis Beyries (I) | |||
| 1936 | 24 october | Oswald Durand | |||
| 1938 | 7 august | Charles André Dumas | |||
| 1938 | november | Jean Louis Beyries (II) | |||
| 1944 | 4 may | Christian-Robert-Roger Laigret | |||
| 1945 | 31 july | René Babin | |||
| 1946 | 30 april | Georges Poirier | |||
| 1946 | 27 october | French overseas territory | |||
| 1947 | 19 july | Lucien Eugène Geay | |||
| 1947 | 31 december | Henry Jean Marie de Mauduit | |||
| 1949 | 7 august | Édouard Louis Terrac | |||
| 1950 | 21 september | Jacques Camille Marie Rogué | |||
| 1952 | 25 april | Pierre Messmer | |||
| 1954 | 6 april | Albert Jean Mouragues | |||
| 1955 | 23 june | Jean Paul Parisot | |||
| 1956 | 14 may | Albert Jean Mouragues (II) | |||
| 1958 | 5 october | Henri Joseph Marie Bernard | |||
| 1958 | 28 november | Independent into French Comunity | Moktar Ould Daddah | ||
| 1959 | february | Amédée Joseph Émile Jean Pierre Anthonioz | |||
| 1960 | 28 november | Republic | Moktar Ould Daddah | ||
| 1978 | 10 july | col. Mustafa Ould Salek | |||
| 1979 | 6 april | Ahmed Ould Bouceif | |||
| 1979 | 28 may | Ahmed Salim Ould Sidi | |||
| 1979 | 31 may | col. Mohamed Khouna Ould Haidalla (I) | |||
| 1979 | 3 june | col. Mohamed Mahmoud Ould Louly | |||
| 1980 | 4 january | col. Mohamed Khouna Ould Haidalla | |||
| 1980 | 12 december | Sid Ahmed Ould Bneijara | |||
| 1981 | 25 april | col. Maaouya Ould Sidi Ahmed Taya (I) | |||
| 1984 | 8 march | col. Mohamed Khouna Ould Haidalla (II) | |||
| 1984 | 12 december | col. Maaouya Ould Sidi Ahmed Taya | col. Maaouya Ould Sidi Ahmed Taya (II) | ||
| 1992 | 18 april | Islamic Arab Republic | col. Maaouya Ould Sidi Ahmed Taya | Sidi Mohamed Ould Boubacar (I) | |
| 1996 | 2 january | Cheikh El Afia Ould Mohamed Khouna (I) | |||
| 1997 | 18 december | Mohamed Lemine Ould Bah Ould Guig | |||
| 1998 | 16 november | Cheikh El Afia Ould Mohamed Khouna (II) | |||
| 2003 | 6 july | Sghair Ould M'Bareck | |||
| 2005 | 3 august | Col. Ely Ould Mohamed Vall | |||
| 2005 | 7 august | Sidi Mohamed Ould Boubacar (II) | |||
| 2007 | 19 april | Sidi Mohamed Ould Cheikh Abdallahi | Zeine Ould Zeidane | ||
| 2008 | 6 may | Yahya Ould Ahmed El Waghef | |||
| 2008 | 6 august | Gen. Sidi Mohamed Ould Cheikh Abdallahi | - | ||
| 2009 | 5 august | Mohamed Ould Abdel Aziz | |||
| 2009 | 11 august | Moulaye Ould Mohamed Laghdaf |