Among the commemorations that marked the tenth anniversary of the terrorist attacks of September 11th was held the conference "September 11th-12th, the Individual and the State Faced with Terrorism" (French Embassy in Washington D.C. April 11th and 12th, 2011). This new trans-Atlantic chapter of the program "Memory and Memorialization" (Partner University Fund) was original in three ways: A transdisciplinary approach, calling to speak specialists in neuroscience, psychoanalysis, psychiatry, history, but also legal experts, law historians, even political science and public policy specialists ; An approach at once retrospective and projective : September 11th is calling upon the competence of social as well as legal historians. Because the te...