This book examines the Ethiopia–Eritrea rapprochement and asks whether it might lead to peace and stability in the Horn of Africa. The Algiers Agreement (2000) that was mediated by the international community – the UN, OAU, EU and USA (the same parties that also served as witnesses and guarantors) – was supposed to be final and binding. But when the Eritrea–Ethiopia Boundary Commission (EEBC) published its verdict, Ethiopia rejected it on the grounds that it awarded Badme, the flashpoint of the war, to Eritrea. The witnesses and guarantors, abdicating their responsibility, failed to exert pressure on Ethiopia, which led to a situation of ‘no war, no peace’. This stalemate lasted for 16 years, until July 2018. The recent rapprochement is driven by internal dynamics, rather than by external mediation. This has fundamentally reshaped the relationship between the two countries. The impact of the resolution of the Ethiopia–Eritrea conflict goes beyond the borders of the two countries, and has indeed brought fundamental change to the region. Full diplomatic relations have been restored between Eritrea and Somalia; and the leaders of Eritrea and Djibouti have met in Jeddah, Saudi Arabia. This all raises the issue of whether a peace deal driven by internal dynamics fares better than one that is externally mediated. The central question that this book attempts to address is: what factors led to the resolution of a festering conflict? The book explains and analyses the rapprochement, which it argues was made possible by the maturing of objective and subjective conditions in Ethiopia and by the trust factor in Eritrea.