Ethiopians voted Monday in an election marked by insecurity, with the ruling Prosperity Party expected to secure a majority.

Over 50 million Ethiopians are registered to vote, with youth and women forming a significant share of the electorate.

When Abiy Ahmed became Ethiopia’s prime minister in 2018, he offered a clean slate for Africa’s oldest uncolonized nation, which had been suffocated by decades of strict state control. His predecessor ...