What nation in sub-Saharan Africa split into a largely Arabic speaking Muslim north and a non-Arabic Christian south in 2011 after decades of civil war?

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Sudan split into two countries, Sudan (north) and South Sudan (south), in 2011 after two civil wars, with the predominantly Arab and Muslim north fighting the predominantly non-Arab and Christian or animist south. This division was largely based on religious and ethnic differences, with the north being Arabic speaking and Muslim, while the south had a diverse range of languages and religions, including Christianity and traditional African religions.

What Nation in Sub-Saharan Africa Split into a Largely Arabic