The relationship between aid and state building is highly complex and the effects of aid on weak states depend on donors’ interests, aid modalities and the recipient’s pre-existing institutional and socio-political conditions. This book argues that, in the case of Afghanistan, the country inherited conditions that were not favourable for effective state building. Although some of the problems that emerged in the post-2001 state building process were predictable, the types of interventions that occurred—including an aid architecture which largely bypassed the state, the subordination of state building to the war on terror, and the short horizon policy choices of donors and the Afghan government—reduced the effectiveness of the aid and undermined effective state building