The U.S. is a nation of immigrants. But unauthorized immigrants have become a source of political debate, and Congress and President Obama disagree over the best course of action to address issues such as deportations, legal status, education and benefits. For years, the Pew Research Center has estimated the size of the unauthorized immigrant population and surveyed the U.S. public about immigration.

Hispanic Jul. 22, 2009

Mexican Immigrants: How Many Come? How Many Leave?

The flow of immigrants from Mexico to the United States has declined sharply since mid-decade, but there is no evidence of an increase during this period in the number of Mexican-born migrants returning home from the U.S.

Hispanic Jul. 2, 2009

Recession Slows — but Does Not Reverse — Mexican Immigration

The flow of immigrants from Mexico to the U.S. has declined sharply since mid-decade, but there is no apparent increase in the number of Mexican-born migrants returning home.

Hispanic Apr. 14, 2009

A Portrait of Unauthorized Immigrants in the United States

Unauthorized immigrants living in the U.S. are more geographically dispersed than in the past and are more likely than either U.S.-born residents or legal immigrants to live in a household with a spouse and children. But the recent rapid growth in the undocumented immigrant labor force has come to a halt. The new report also includes population and labor force estimates for each state.

Hispanic Feb. 18, 2009

A Rising Share: Hispanics and Federal Crime

Sharp growth in illegal immigration and increased enforcement of immigration laws have dramatically altered the ethnic composition of offenders sentenced in federal courts.