From the Document: "Ethiopia is Africa's oldest independent state and its second most populous country. It hosts the headquarters of the African Union (AU) and is the world's largest troop contributor to U.N. peacekeeping operations, with forces deployed in U.N. missions in neighboring Sudan and South Sudan, and in Somalia as part of a multinational effort to counter the Al Qaeda affiliate Al Shabaab. The United States has viewed Ethiopia as an important security partner in a volatile region. The bilateral relationship, which dates back over 100 years, has been strained at times by tensions over human rights and governance concerns."
CRS In Focus, IF10185
Congressional Research Service: https://crsreports.congress.gov/