French citizenship and naturalization records are a rich genealogical resource, reflecting the country’s complex legal history regarding nationality. Records are maintained centrally at the Archives Nationales and in departmental archives. Naturalization decrees, lists of granted citizenships (bulletins des lois), and individual case files often contain personal details, including birthplaces, family members, and former nationalities. Since the 19th century, French law has also required public declarations of intent and name changes, which may appear in civil and judicial records. Passport applications and registers, maintained locally, further enrich research by tracing internal and international migrations. These records are indispensable for understanding immigrant ancestors’ legal integration into French society.
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