South Sudan
South Sudan is admitted to the United Nations, the first new member since 2006.
Sources: BBC News
Sources: BBC News
Gunmen kill 12 United Nations peacekeepers and civilian staff in an ambush in Jonglei, South Sudan.
South Sudan appoints Francis Deng as its first ambassador to the United Nations.
The United Nations says 120,000 people in South Sudan required aid amid tribal fighting.
The UN says 600 people have been killed in clashes in South Sudan.