This new study shows how the American-led ‘war on terror’ has brought about the most significant shift in the contours of the international system since the end of the Cold War. A new ‘imperial moment’ is now discernible in US foreign policy in the wake of the neo-conservative rise to power in the USA, marked by the development of a fresh strategic doctrine based on the legitimacy of preventative military strikes on hostile forces across any part of the globe. Key features of this new volume include an alternative, critical take on contemporary US foreign policy; a timely, accessible overview of critical thinking on US foreign policy, imperialism and war on terror; the full spectrum of critical views in a single volume. Many of these essays are now ‘contemporary classics.’ The essays collected in this volume analyse the historical, socio-economic and political dimensions of the current international conjuncture, and assess the degree to which the war on terror has transformed the nature and projection of US global power. Drawing on a range of critical social theories, this collection seeks to ground historically the analysis of global developments since the inception of the new Bush Presidency and weigh up the political consequences of this imperial turn.