More than four million Syrians have been forced to flee their homes since the start of the country's civil war began in 2011. The length of the war, along with the number of other humanitarian crises around the world, has seen funding for the crisis plummet.
The United Nations asked for $7.42 billion this year to cover the needs of the Syrians both still inside Syria and those who have escaped to neighboring countries. As of early October, they were still $4 billion short of their annual goal.
The United States has donated $4.5 billion in humanitarian aid since the crisis began, but has been criticized recently for the relatively small number of refugees it has agreed to resettle.