More than 10 million illegal immigrants live in the United States, and 1,400 more arrive every day. Once concentrated in a few big states like Texas and California, they are rapidly moving into non-traditional areas such as the Midwest and South. Willing to work for low wages, the migrants are creating a backlash among some residents of the new states, which have seen a nearly tenfold increase in illegal immigration since 1990. While illegal immigrants only make up about 5 percent of the U.S. work force, critics of the nation's immigration policies say illegal immigrants take Americans' jobs, threaten national security and even change the nation's culture by refusing to assimilate. But immigrants' advocates say illegal migrants fill the jobs Americans refuse to take and generally boost the economy. Proposals to deal with illegal immigration include the Real ID bill, which would block states from issuing driver's licenses to undocumented immigrants, and "guest worker" programs granting temporary legal status to illegal workers.

Peter Katel is a CQ Researcher staff writer who previously reported on Haiti and Latin America for Time and Newsweek and covered the Southwest for newspapers in New Mexico. He has received several journalism awards, including the Bartolomé Mitre Award for drug coverage from the Inter-American Press Association and awards for investigative and interpretive reporting from the New Mexico Press Association. He holds an A.B. in university studies from the University of New Mexico.