In the latest twist in Ethiopia’s current political dramas, Prime Minister Hailemariam Desalegn formally submitted his resignation from his position as the nation’s premier and as chairman of the ruling EPRDF coalition. That’s a dramatic development — and no one knows where it will lead. Hailemariam was elected as a compromise candidate who could balance the interests of various factions within the ruling coalition and maintain the status quo. He appeared to manage this well — until recently.

So how did autocratic Ethiopia, a U.S. ally and Africa’s second-most-populous country, end up in its current tumult? Here’s what you need to know.

Read Research Director Lovise Aalens analysis of why Ethiopia has been in upheaval since 2015 in Washington Posts blog, Monkey Cage