This book deals with Border Conflicts between and among the core countries of the Horn of Africa: Ethiopia, Eritrea, Somalia, and Djibouti, 1960-2000. It discusses how the colonial boundary was imposed on the people and states of the region, how people of the same ethnic group were divided and made to be ruled under different sovereign states, and the impact the colonial boundary making had in the post-colonial era in the inter-state relations in the Horn of Africa. In this discussion, Ethiopia was put at the center considering its central location where the rest countries of the Horn surround the country which made her to have a boundary problem with all of them. Accordingly, Ethiopia was at war with all of the in different times around the border areas. The history of the Somali people classification into different areas being ruled under different states and the emergence of the Somali irredentism was highly discussed. The issue which made Eritrea to claim her independence from Ethiopia was also directly related to the European colonial administration in the Horn of Africa, and this was also one central discussion in the book. The book is worth reading to any interested body.