The People's Democratic Republic of Ethiopia (PDRE) () was a socialist state that existed in Ethiopia and present day Eritrea from 1987 to 1991. The PDRE was established in February 1987 as a Marxist-Leninist one-party state upon the adoption of the 1987 Constitution, three weeks after approval in the national referendum. The Derg, the military junta that had ruled Ethiopia as a provisional government since 1974, planned for transition to civilian rule and proclaimed a socialist republic in 1984 after five years of preparation. The Workers' Party of Ethiopia (WPE) was founded that same year as a vanguard party led by Derg chairman Mengistu Haile Mariam. The Derg was dissolved with the proclamation of the PDRE, but continued to rule de facto until September when the new government took office, three months after the June general election. It was dominated by surviving Derg members, with Mengistu as both President of Ethiopia and General Secretary of the WPE. The PDRE's government was highly centralized with a de facto power structure similar to other communist states. The legislature, the National Shengo, was nominally the highest organ of state power. A president served as head of state and head of government, with sweeping executive and legislative powers. The president served as chairman of the Council of State, which acted for the Shengo between sessions. In practice, the principles of democratic centralism meant that the Shengo did little more than rubber-stamp decisions already made by the WPE and its Politburo. As both president and party leader, Mengistu was a virtual dictator. He and the surviving members of the Derg dominated the WPE's Politburo. The constitution guaranteed all manner of personal freedoms, but the government paid almost no attention to them in practice. The PDRE inherited issues that ravaged Ethiopia during the Derg era including the 1983–1985 famine, reliance on foreign aid, and the decline of the world communist movement. The Soviet Union ended support of the PDRE in 1990, and internal conflict brought on by the Ethiopian Civil War and Eritrean War of Independence saw the WPE's authority increasingly challenged by ethnic militias and anti-government groups. In May 1991, Mengistu fled into exile. The regime only lasted another week before the Ethiopian People's Revolutionary Democratic Front entered Addis Ababa, dissolving the PDRE and replacing it with the Transitional Government of Ethiopia. Advances Following the demise of imperial rule, the feudal socioeconomic structure was dismantled