The world’s youngest country may be headed toward civil war, following the rebel seizure of Bentiu. The violence stems from President Kiir’s decision to sack his deputy, Riek Machar, in July. The President comes from the Dinka community, and troops loyal to Machar, from the Nuer community, have clashed with state forces and seized oil-rich regions. After fighting killed hundreds last week, the U.S. military evacuated Americans from the city of Bor. The evacuations took place amid an exodus of South Sudanese refugees and international workers from the troubled region.