In July 1977, sensing the disarray in Ethiopia, Somalia attacked across the Ogaden in pursuit of its irredentist claims to the ethnic Somali areas of Ethiopia (see Ogaden War). They were assisted in this invasion by the armed Western Somali Liberation Front. Ethiopian forces were driven back far inside their own frontiers but, with the assistance of a massive Soviet airlift of arms and Cuban combat forces, they stemmed the attack. The last major Somali regular units left the Ogaden March 15, 1978. Twenty years later, the Somali region of Ethiopia remains under-developed and insecure.
From 1977 through early 1978, thousands of suspected enemies of the Derg were tortured and/or killed in a purge called the "red terror". Communism was officially adopted during the late 1970s and early 1980s; in 1984, the Workers' Party of Ethiopia (WPE) was established, and on February 1, 1987, a new Soviet-style civilian constitution was submitted to a popular referendum. It was officially endorsed by 81% of voters, and in accordance with this new constitution, the country was renamed the People's Democratic Republic of Ethiopia on September 10, 1987, and Mengistu became president.
The regime's collapse was hastened by droughts and famine, which affected around 8 million people, leaving 1 million dead, as well as by insurrections, particularly in the northern regions of Tigray and Eritrea. In 1989, the Tigrayan Peoples' Liberation Front (TPLF) merged with other ethnically-based opposition movements to form the Ethiopian Peoples' Revolutionary Democratic Front (EPRDF). In May 1991, EPRDF forces advanced on Addis Ababa. Mengistu fled the country to asylum in Zimbabwe, where he still resides.
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