Feeling the political necessity of building a strongly unified nation, the Revolution standardized the territorial administration by redividing the country into new administrative units, the "departments," thereby breaking up the former provinces which had long fought for their administrative and judicial autonomy, and by undertaking the abolition of regulations restricted to any particular part of the country or of the population. The fundamental result of today's administrative and territorial organization is that this unitary system over the whole territory places all citizens under the same law.
Rene de Chambrun,
The Development of French Law,
19 Clev. St. L. Rev.
available at https://engagedscholarship.csuohio.edu/clevstlrev/vol19/iss2/43