"In 2012, the Department of Homeland Security (DHS) began granting deferred action through the Deferred Action for Childhood Arrivals (DACA) program to certain individuals without lawful immigration status who had arrived in the United States as children and met other requirements. The requirements included initial entry into the United States before age 16, continuous U.S. residence since June 15, 2007, and being under age 31 as of June 15, 2012. Deferred action provides protection against removal from the United States. Individuals granted deferred action also may receive work authorization. Initial grants of deferred action under DACA were for two years and could be renewed in two-year increments. As of March 31, 2017, DHS had approved 787,580 initial requests for DACA from applicants residing in all 50 states, the District of Columbia, and several U.S. territories"
CRS Insight, IN10777
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html