1961:November
Mauritania
*Sub-Hierarchial*/*Interim*
37
1961:December
Sub-Authoritarian/Sub-Hierarchial
44
-7
Ould Daddah installed as official president
________________________________________
1961:December
Mauritania
Sub-Hierarchial
24
1964:
*Sub-Hierarchial*/*Interim*
37
-13
One-Party State established following merger of political parties into PPM. Constitution in 1964 confirms this. No institutional change, besides possible transition to Hierarchial.
