Second Sudanese Civil War (1983-2005)
A two-decade north-south war killed an estimated 2 million people and displaced 4 million. It ended with the 2005 Comprehensive Peace Agreement, which led to South Sudan's independence in 2011.
The peace agreement ended Africa's longest-running civil war at the time.
Sudan's southern region seceded, but Darfur and other western conflicts continued.
Sudan's history shows its internal wars persist for decades, and external mediation usually becomes the only exit.
