Nov. 2015. A majority of the 1 million who left the U.S. for Mexico between 2009 and 2014 left of their own accord, according to the Mexican government’s ENADID survey data. The Mexican survey also showed that six in ten (61%) return migrants (those who reported they had been living in the U.S. five years earlier but as of 2014 were back in Mexico) cited family reunification as the main reason for their return. By comparison, 14% of Mexico’s return migrants said the reason for their return was deportation from the U.S.