Undocumented immigrant population rose to 1 million in 2010 . Number of those who crossed the U.S. borders illegally and those who lost their visa . Pew estimated there are now about 6 million Mexican undocumented immigrants in the United States . States such as Georgia and North Carolina have seen a population decline . New numbers may affect the debate on potential comprehensive immigration policies .
Undocumented immigrant population rose to 1 million in 2010 . Number of those who crossed the U.S. borders illegally and those who lost their visa . States such as Georgia and North Carolina have seen a population decline . New numbers may affect the debate on potential comprehensive immigration policies .