It was the beginning of a civil war. Ethiopia is a vast and diverse country, with dozens of distinct ethnic groups, many of which want some degree of autonomy. The current prime minister, Abiy Ahmed, was elected in 2018 on a wave of optimism following nearly three decades of repressive minority dominance by the Tigray People’s Liberation Front in the ruling coalition. (The Tigrayan ethnic group makes up only 6 percent of Ethiopia’s population.) Under its leadership, the country had economic growth, but the T.P.L.F. brutally suppressed political opposition and free speech, leading to festering resentment among Ethiopians from other ethnic groups. Abiy, who is Oromo, the country’s largest ethnic group, which has been historically underrepresented in national leadership, removed Tigrayans from their government posts and later referred to the T.P.L.F. as a “cancer” and as “weeds” that needed to be eradicated.