International borders often seem like clean lines on a map, but the reality is far more complex.Explore some of the world’s ...

A peace deal ending a conflict that killed tens of thousands in South Sudan is in danger of collapsing, raising fears that the world’s youngest nation — and one of its poorest — could ...

Instead, South Sudan’s tenuous peace is on the verge of collapse, with Mr. Machar accused of inciting an antigovernment rebellion led by a militia known as the White Army.

South Sudan’s government has struggled since independence from Sudan in 2011 to deliver many of the basic services of a state. Years of conflict have left the country heavily reliant on aid that ...