There were 11.5 million undocumented immigrants in the United States in 2011 . : Percentage of those removed who were convicted criminals . The U.S. government has been cracking down on illegal immigration for years, but it's not clear how effective that crackdown is. It takes about five months on average to process an application for naturalization .
There were 11.5 million undocumented immigrants in the United States in 2011 . The U.S. government has been cracking down on illegal immigration for years, but it's not clear how effective that crackdown is. It takes about five months on average to process an application for naturalization .