French law permits dual nationality and does not require foreigners who obtain French nationality to give up their original one. A naturalized immigrant can therefore legally have French nationality and the nationality of another country.
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For any stay in France exceeding 90 days, you are required to apply in advance for a long-stay vis. In this instance your nationality does not exempt you from requirements. Whatever the duration of your planned stay, the duration of your long-stay visa must be between three months and one year.