Résumé
The September 11, 2001 attacks on American soil is the beginning of a long war between the United States and the International terrorism, particularly with Al-Qaeda and Islamist movements. This paper analyses the relation between the US and the Islamism movements and suggest that these relations are governed by a new American doctrine, the ‘Radical Islamism containment’, which started with George W. Bush and continued with the successive American Presidents. This new doctrine replaces the old doctrine of ‘Communism containment’ and presents the same schema with military interventions and political and economical pressures and sanctions on Islamist movements.