stylistic:style_transfer
Haile Selassie I era (1916–1974)

The early 20th century was marked by the reign of Emperor Haile Selassie (Ras Tafari). He came to power after Lij Iyasu was deposed, and undertook a nationwide modernization campaign from 1916 when he was made a Ras and Regent (Inderase) for the Empress Regnant Zewditu, and became the de facto ruler of the Ethiopian Empire. Following Zewditu's death, on 2 November 1930, he succeeded her as emperor. In 1931, Haile Selassie endowed Ethiopia with its first-ever Constitution in emulation of Imperial Japan's 1890 Constitution. The independence of Ethiopia was interrupted by the Second Italo-Ethiopian War, beginning when it was invaded by Fascist Italy in early October 1935, and by subsequent Italian rule of the country (1936–1941) after Italian victory in the war. Italy, however, never managed to secure the country in its totality, due to resistance from the Arbegnoch, making the colonization of Ethiopia brief, with Italy being able to operate just a few changes, including building some infrastructures and abolishing slavery. Following the entry of Italy into World War II, British Empire forces, together with the Arbegnoch, liberated Ethiopia in the course of the East African campaign in 1941. The country was placed under British military administration, and then Ethiopia's full sovereignty was restored with the signing of the Anglo-Ethiopian Agreement in December 1944.

On 24 October 1945, Ethiopia became a founding member of the United Nations. In 1952, Haile Selassie orchestrated a federation with Eritrea. He dissolved this in 1962 and annexed Eritrea, resulting in the Eritrean War of Independence. Haile Selassie also played a leading role in the formation of the Organisation of African Unity (OAU). Opinion within Ethiopia turned against Haile Selassie, owing to the worldwide 1973 oil crisis causing a sharp increase in gasoline prices starting on 13 February 1974, leading to student and worker protests. The feudal oligarchical cabinet of Aklilu Habte-Wold was toppled, and a new government was formed with Endelkachew Makonnen serving as Prime Minister.