President Obama is requesting $3.7 billion to deal with the growing migrant-crisis. Vox takes a look at how the money will be spent, and provides a backgrounder on the crisis.

+ “Most of the children come from Guatemala, Honduras, or El Salvador. They have crossed the entire length of Mexico. A number of them are in desperate shape. Nobody knows how many more started north and never arrived. Some of the survivors say that they fled violence and threats at home. Some are searching for relatives. Some have been told by traffickers that the United States will not deport them.” The New Yorker’s William Finnegan on the children at the border.