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On Jan. 9, North and South Sudan marked the fifth anniversary of the Comprehensive Peace Agreement that brought an end to Africa’s longest civil war, but the mood has been anything but celebratory as the two sides proceed toward a referendum over Southern secession. Long-simmering ethnic tensions in the South are boiling into unrest — stoked, according to many in the Southern capital of Juba, by a Khartoum government unwilling to contemplate the oil-rich South’s seemingly inevitable secession. A massacre in Warrap state on Jan. 7, that left at least 139 dead and nearly 100 injured, was the latest clash […]