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South Sudan is the world's newest nation, after seceding from Sudan in 2011.

Slave raids were widely reported to have continued until the end of the civil war in 2005, which led to the mainly black African South Sudan seceding from Arabic-speaking Sudan six years later.

Carter spoke about Sudan — its possibilities and dangers, and the fact that in coming months the country’s south, with its vast oil reserves, would hold an independence referendum on whether to secede from the north.

The issue was caught up in a mayoral campaign and a 2001 ballot measure calling for the Valley to secede from the city.

“Why wasn’t that settled?” he said on Fox & Friends, prompting a rare pushback from a host, who noted that Southern states had seceded before Lincoln took office.