There were ethnic undertones between the Dinka and Nuer in the fighting . About 400,000 people are estimated to have been killed in the war , including notable atrocities such as the 2014 Bentiu massacre . More than 4 million people have been displaced , with about 1.8 million of those internally displaced , and about 2.5 million having fled to neighboring countries , especially Uganda and Sudan
2014 Bentiu massacre
2014 Bentiu massacre
History of South Sudan