Democratic Republic of Congo: Background and U.S. Relations [Updated April 30, 2019] [open pdf - 1MB]
From the Summary: "The United States and other donors have focused substantial resources on stabilizing the Democratic Republic of Congo (DRC) since the early 2000s, when 'Africa's World War'--a conflict that drew in multiple neighboring countries and reportedly caused millions of deaths-- drew to a close. DRC hosts the world's largest U.N. peacekeeping operation and is a major recipient of donor aid. Conflict has nonetheless persisted in eastern DRC, prolonging instability and an enduring humanitarian crisis in Africa's Great Lakes region. New unrest erupted as elections were repeatedly delayed past 2016, their scheduled date, leaving widely unpopular President Joseph Kabila in office. Security forces brutally cracked down on protests, while new conflicts emerged in previously stable regions, possibly fueled by political interference. An ongoing Ebola outbreak in the east has added to DRC's challenges. In April 2019, the Islamic State organization claimed responsibility for an attack on local soldiers in the Ebola-affected area, an apparent effort to rebrand a local armed group known as the Allied Democratic Forces."
CRS Report for Congress, R43166
Congressional Research Service: https://crsreports.congress.gov/