The State Department says the United States is pledging nearly $133 million in additional humanitarian assistance to South Sudan's refugees and internally displaced people.
The aid comes amid discussions over whether the U.S. should cut its aid to the country trying to recover from civil war.
Secretary of State John Kerry last month said U.S. humanitarian assistance to South Sudan will not continue forever if its leaders "are not prepared to do what's necessary for their people.''
More than one million people have fled South Sudan since fighting broke out in December 2013, and more than 1.6 million people have been internally displaced. Tens of thousands have been killed in the world's youngest country.
The United States has given nearly $1.9 billion in aid since the civil war started.