Terrorism in the Twenty-First Century helps readers understand terrorism, responses to it, and current trends that affect the future of this phenomenon. Putting terrorism into historical perspective and analysing it as a form of political violence, this text presents the most essential concepts, the latest data, and numerous case studies to promote effective analysis of terrorist acts.Terrorism in the Twenty-First Century objectively breaks down the who-what- why-how of terrorism, giving readers a way both to understand patterns of behavior and to more critically evaluate forthcoming patterns.　New to the Ninth Edition:Uses a key contemporary challenge of terrorism—the emerging radicalization via social media platforms—as a thread to link its chapters, especially in terms of domestic terror threats and the rise of the far right in the US and abroad.Discusses the evolving "fifth wave" of modern terrorism, linking and radicalizing groups and individuals in all parts of the globe, recruiti