Ethiopia-Eritrea War (1998–2000)
A border dispute over the town of Badme erupted into a full interstate war, with Eritrean and Ethiopian forces fighting along a front stretching hundreds of kilometers.
The Algiers Agreement ended the war in 2000, but the border dispute festered for two decades.
The rivalry reshaped Horn of Africa politics and set the stage for later conflicts, including the 2020 Tigray war.
It shows how quickly Ethiopia-Eritrea relations can collapse into interstate war, a risk now that both countries have cut diplomatic ties.
