The South Sudan state of Upper Nile has been flooded with refugees crossing the border from Sudan . US : US Secretary of State Hillary Clinton praised the deal Saturday . While most oil fields are in the south , the airport and port are in the north . South Sudan halted oil production in 2011 after accusing Sudan of stealing .
US : US Secretary of State Hillary Clinton praised the deal Saturday . While most oil fields are in the south , the airport and port are in the north . South Sudan halted oil production in 2011 after accusing Sudan of stealing .