Unconquerable Nation: Knowing Our Enemy, Strengthening Ourselves (ISBN 0-8330-3893-1) is a book written by Brian Michael Jenkins, one of the world's foremost authorities on terrorism.
In it the author asserts that some of America's recent approaches to counterterrorism have been counterproductive.
The book is based in part on objective research, particularly as it applies to knowing the enemy, and it also includes the personal reflections of Brian Michael Jenkins, who draws on 40 years of terrorism research.
Jenkins describes Islamism in terms of a worldwide "jihadist enterprise" directly at odds with the underpinnings of Western civilization.
His book describes several strategic principles to guide the response of the West and particularly America: