structural:scholar_edition, stylistic:tone
Fall of monarchy

The government's failure to adequately respond to the 1973 Wollo famine, the growing discontent of urban interest groups, and high fuel prices due to the 1973 oil crisis led to a revolt in February 1974 by the army and civilian populace. In June, a group of military officers formed the Coordinating Committee of the Armed Forces, Police, and Territorial Army also known as the Derg to maintain law and order due to the powerlessness of the civilian government following the widespread mutiny.

In July, Emperor Haile Selassie gave the Derg key concessions to arrest military and government officials at every level. Soon both former Prime Ministers Tsehafi Taezaz Aklilu Habte-Wold and Endelkachew Makonnen, along with most of their cabinets, most regional governors, many senior military officers and officials of the Imperial court were imprisoned. In August, after a proposed constitution creating a constitutional monarchy was presented to the Emperor, the Derg began a program of dismantling the imperial government to forestall further developments in that direction. The Derg deposed and imprisoned the Emperor on 12 September 1974 and chose Lieutenant General Aman Andom, a popular military leader and a Sandhurst graduate, to be acting head of state. This was pending the return of Crown Prince Asfaw Wossen from medical treatment in Europe when he would assume the throne as a constitutional monarch. However, General Aman Andom quarrelled with the radical elements in the Derg over the issue of a new military offensive in Eritrea and their proposal to execute the high officials of Selassie's former government. After eliminating units loyal to him: the Engineers, the Imperial Bodyguard and the Air Force, the Derg removed General Aman from power and executed him on 23 November 1974, along with some of his supporters and 60 officials of the previous Imperial government.

Brigadier General Tafari Benti became the new chairman of the Derg and the head of state. The monarchy was formally abolished in March 1975, and Marxism-Leninism was proclaimed the new ideology of the state. Emperor Haile Selassie died under mysterious circumstances on 27 August 1975 while his personal physician was absent. It is commonly believed that Mengistu Haile Mariam killed him, either by ordering it done or by his own hand although the former is more likely.