This book offers a concise account of US "dual containment" policy towards Iran and Iraq during the 1990s, an overlooked era between the tumult of the liberation of Kuwait and the terrorist attacks of September 11, 2001. In particular, it uses a theoretical framework derived from neoclassical realism to examine the impact of domestic US politics and interest groups on policymaking, as well as perceptions of threat derived from two decades of mutual hostility between the US and Iran.