it's a huge, fortified slum in juba where u.n. peacekeeping soldiers provide a little security.n south sudan's civil war broke out in 2013, it quickly became fueled by tribal divisions. president salva kiir, of the dinka tribe, pitted against his vice president riak machar, from the nuer tribe. dinka government soldiers have been fighting rebels, led mostly by the nuer tribe, all across the country. both sides are accused of taking part in war crimes. one of those crimes: rape. it has become a tool of war here, used with barbaric consistency. a ruthless form of collective punishment against rival tribes, gang-raped by soldiers. this young mother of four is now eight months' pregnant. >> ( translated ): this is the result of tribalism. if it wasn't, then the fight would be between soldier and soldier. but now they do this to women. they are raping women because our husbands are not here. they are rebels, away fighting. when they were raping me, they kept calling me a nuer and a rebel. >> reporter: soon, she will have yet another child to care for, in this desperate poverty. the i

people in urban areas like the capital, juba, can get help. international medical corps runs this hospital. in the intensive care ward for children, dr. sadia azam shows us how she diagnoses malnutrition. so she is in danger? >> yes, she is in danger. she is severely acutely malnourished. >> reporter: what's causing that for her? >> the children are like this. their bodies are very fragile, they are very weak. >> reporter: and weak bodies can't fight off deadly diseases. one and a half-year-old nyagoah also has pneumonia. this hospital exists largely because of u.s. government funding. american money is responsible for much of the aid relief in south sudan, whether it's food drops from planes or the seeds and tools distributed in famine areas. cuts to foreign aid proposed by the trump administration could mean less money makes it here, and charities are nervous. jason straziuso is the regional spokesperson for the international committee of the red cross. >> the united states is the largest single supporter of the i.c.r.c., a substantial part

for the pbs newshour, i'm jane ferguson in juba, south sudan. >> brangham: for the record, the southanese information minister canceled an interview with jane ferguson, to respond to charges against the government. tomorrow, jane reports on the famine that the war has caused. >> brangham: stay with us, coming up on the newshour: a weekend chock-full of politics kicks off a busy week on capitol hill. our politics monday duo breaks it all down. and a behind-the-scenes look at one of the world's fastest growing social media networks. but first, a new investigative report finds a disturbing pattern. sexual abuse of students by other students happens more frequently in schools than reported. and the consequences for the offenders vary considerably. jeffrey brown has the story. >> brown: "a hidden horror educators have long been warned not to ignore." that's the description of sexual abuse in schools by the associated press, which published its story today. a.p. reporters found that students were seven times more likely than adults to sexually assault another student. during a four year pe