The period from 1935 to 1991 is an eventful portion in the history of modern Ethiopia. The period consists of such great events of the Italian invasion and occupation, the patriotic (Arbagnenat) struggle, the restoration of the sovereignty of Ethiopia, and the Anglo-American influences in the socio-economic, diplomatic, and military aspects of the country. The period witnesses the diplomatic endeavors and achievements of the reintegration of Eritrea and the Ogaden. Despite the fact that the restored government declared the post-liberation period as “Addis Zemen” (New Era), it has faced protracted and nagging oppositions from the various sections of the society that include peasants, the military, veteran patriots, students… This book also embraces the popular revolutionary movements and the fall of the monarchy and the establishment of the Derg military government. The book ends with conclusive remarks on the fall of the Derg in 1991.