The thousands of children who have fled to the USA are not "economic migrants" but refugees fleeing for their lives to escape unparalleled violence in their home countries, as innumerable news organizations have pointed out.
"They're not here to take advantage of American social services — they're refugees from conflict.
….
These charts show that the murder rate in Honduras in 2012 was a whopping 30 percent higher than UN estimates of the civilian casualty rate at the height of the Iraq war."
http://www.vox.com/2014/6/30/5842054/violence-in-central-america-and-the...
The United Nations is working at this moment to have these children declared refugees by the U.N. High Commissioner for Refugees (UNHCR).
http://www.nbcnews.com/storyline/immigration-border-crisis/un-m