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South Sudanese People Liberation Army (SPLA) soldier patrols in Malakal on January 21, 2014. Pressure mounted on South Sudan's warring parties Tuesday to reach a ceasefire to end weeks of bitter fighting and atrocities on both sides that have devastated the young nation.Thousands have been killed and half a million civilians forced to flee the fighting between troops loyal to President Salva Kiir and rebels allied to his sacked deputy Riek Machar. AFP PHOTO / HARRISON  NGETHI        (Photo credit should read HARRISON NGETHI/AFP/Getty Images)
South Sudanese People Liberation Army (SPLA) soldier patrols in Malakal on January 21, 2014. Pressure mounted on South Sudan's warring parties Tuesday to reach a ceasefire to end weeks of bitter fighting and atrocities on both sides that have devastated the young nation.Thousands have been killed and half a million civilians forced to flee the fighting between troops loyal to President Salva Kiir and rebels allied to his sacked deputy Riek Machar. AFP PHOTO / HARRISON  NGETHI        (Photo credit should read HARRISON NGETHI/AFP/Getty Images)

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South Sudan: How we got here

Fighting erupts in South Sudan as the country celebrates its 5th anniversary. CNN's David McKenzie explains how this new country ended up in a battle for power.

South Sudan: How we got here

Fighting erupts in South Sudan as the country celebrates its 5th anniversary. CNN's David McKenzie explains how this new country ended up in a battle for power.