Examining the broad contexts of US foreign policy and the lingering aftermath of the Vietnam War, David Ryan argues that these events created an opportunistic framing of 9/11, paving the way for the long-held neo-conservative desire for regime change and war in Iraq. He examines the construction of the cultural framework for war following 9/11, the legitimacy of military force in Afghanistan, the rise of anti-Americanism, within the broader contexts over the struggle over legitimacy, identity and leadership. Turning the 'clash of civilisations' thesis on its head, Ryan presents a careful analysis of the evolution of US foreign policy and its engagement with Iraq through the 1980s. While 9/11 provided the opportunity, the post-Vietnam context provides a more pertinent framework for this reflection on the Gulf War, the Iraq War and the strategic implications for US foreign policy.