United Nations Security Council Resolution 1999 was adopted without a vote on 13 July 2011 after examining the application of the Republic of South Sudan for membership into the United Nations. The Council recommended to the General Assembly that South Sudan be admitted.
The resolution was adopted following a request from South Sudan President Salva Kiir. South Sudan became the 193rd member of the United Nations.
Enlargement of the United Nations
List of United Nations member states
List of United Nations Security Council Resolutions 1901 to 2000 (2009–2011)
Text of the Resolution at undocs.org