Sudan borders seven nations — Egypt, South Sudan, Chad, Central African Republic, Libya, Ethiopia and Eritrea — each of which have faced war, violent civil unrest or political upheaval in recent years. War-weary South Sudan — one of the world’s poorest countries — is ill-equipped to absorb Sudanese refugees or returning expatriates. The mainly African and Christian or animist South Sudan gained independence from Arab and Muslim-majority Sudan in 2011, ending decades of civil war. But in 2013 a civil war began again in South Sudan, fueled by unsettled ethnic divisions and feuding leaders. The north of South Sudan is economically dependent on Sudan, and the fighting has disrupted supplies of critical food and goods.