South Sudan’s main rivals were at loggerheads Friday over who will control the country’s 10 internal states, an issue that analysts and diplomats worried could jeopardise a power-sharing deal reached earlier this year. President Salva Kiir and rebel leader Riek Machar, old foes whose fallout in 2013 sparked a civil war, agreed on February to form a new government after intense international pressure to deliver lasting peace to the conflict-torn country. But while they managed to name a cabinet in March, they have yet to strike a deal on who can appoint governors to the states. On Thursday night Kiir announced a breakthrough on the state’s issue, saying his party would appoint six governors while Machar’s would appoint three. The remaining state would be governed by the South Sudan Oppositi...