Climate variability, political crises, and historical population displacements in Ethiopia

El Niño events from the 1970s through the 1990s caused extended droughts in Ethiopia. These droughts were followed by famine and political turmoil that resulted in radical changes of government, secession, and a massive program of population redistribution. Cartographic analysis of Ethiopian census data from 1984 and 1994 shows changes in demographic patterns. The consequences of government-imposed migration policies, whose catalyst was the climate variability caused by repeated El Niño events, were changes in the ethnic composition of certain Ethiopian regions and changes in the geographic pattern of population growth.