Portraits of Instability

4. CHAD

Feuding neighbors: A Chadian soldier looks on as protests fill the Chadian capital of N'Djamena on May 13, 2009, where President Idriss Déby denounced his eastern neighbor, Sudan. Just a few weeks earlier, the two countries had agreed to end years of proxy battles on each others' territories. But two days later, Chad accused Sudan of attacking its forces along the border. The neighbors' spat has helped exacerbate conflict that has now spread from Darfur into eastern Chad and the Central African Republic.

GEORGES GOBET/AFP/Getty Images

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