Examining some of the huge challenges that liberal States faced in the decade after 11 September 2001, this book addresses three aspects of the impact of more than a decade of military action. It considers different expressions of universalist moral aspirations, including the prohibition of torture, and discusses migration and 'responsibility to protect,' as well as the United Nations Human Rights Committee's Concluding Observations about security and liberty in the last decade. International humanitarian law and the problems posed by the territorial character of war and the effects of new technologies and child soldiers are also analysed.