When France annexed the left bank of the Rhine, including areas like Dittweiler, several administrative changes were implemented. The region was reorganized under French control, and the administrative structure was aligned with the French system. This included:

1. Integration into French Departments: The left bank of the Rhine was divided into several departments. Dittweiler, being part of this region, was likely integrated into one of these departments. The French administrative system was based on departments, arrondissements, cantons, and communes.

2. Legal and Administrative Reforms: French laws and administrative practices were introduced. This included the Napoleonic Code, which reformed civil law and was implemented across the annexed territories.

3. Local Governance: Local governance structures were altered to fit the French model. This often meant the replacement of local officials with those appointed by the French government or the restructuring of local councils to align with French administrative practices.

4. Economic and Social Changes: The annexation also brought economic and social changes, as the region was integrated into the French economic system. This included changes in taxation, trade regulations, and possibly land ownership laws.

These changes were part of a broader effort by France to consolidate control over the annexed territories and integrate them into the French state.