Louis-Lucas, Pierre Keywords: Nationality | Private international law | Mots clefs: Nationalité | Droit international privé | ABSTRACT Nationality is the legal relationship which unites an individual to his State, notes Pierre Louis-Lucas. Nationality conflict is an abnormal fact or its relationship is multiple or this relationship is nonexistent. After the briefing of a few general considerations, the author studies the national solution for nationality conflicts. He then focuses on the international solution fo…