<P><EM>Terrorism in the Twenty-First Century</EM> 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. <I>Terrorism in the Twenty-First Century</I> 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.</P><P> </P><B><P>New to the Ninth Edition:</P><UL></B><P><LI>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.</LI><P></P><P><LI>Discusses the evolving "fifth wave" of modern terrorism, linking