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.

GlobalDecember 31, 2015

Your favorite Fact Tank data in 2015

From Millennials in the workforce to religion in America, our most popular posts told important stories about trends shaping our world.

HispanicNovember 20, 2015

What we know about illegal immigration from Mexico

Pew Research Center tracks the origins of unauthorized immigrants, their participation in the labor force and where in the U.S. they are settling.

HispanicNovember 19, 2015

5 facts about illegal immigration in the U.S.

The number of unauthorized immigrants in the U.S. has stabilized in recent years after decades of rapid growth. Here are five facts from our latest analysis of this population.

HispanicNovember 19, 2015

More Mexicans Leaving Than Coming to the U.S.

Between 2009 and 2014, about 140,000 more Mexican immigrants have returned to Mexico from the U.S. than have migrated here, citing family reunification as the main reason for leaving.

U.S. PoliticsOctober 8, 2015

On Immigration Policy, Wider Partisan Divide Over Border Fence Than Path to Legal Status

As immigration emerges as a key issue in the presidential campaign, there is little common ground between Republicans and Democrats in views of several immigration policy proposals.

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HispanicSeptember 28, 2015

Statistical Portrait of the Foreign-Born Population in the United States, 1960 – 2013

There were a record 41.3 million immigrants living in the U.S. in 2013, making up 13.1% of the nation’s population, a fourfold increase since 1960. These interactive charts explore immigration population trends, from origin to length of time in the U.S., to age and language use.

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HispanicSeptember 28, 2015

Selected U.S. Immigration Legislation and Executive Actions, 1790 – 2014

Explore how immigration in the U.S. was shaped by laws and acts in this interactive timeline of U.S. immigration legislation since the 1790s.

HispanicSeptember 28, 2015

Modern Immigration Wave Brings 59 Million to the U.S.

The nation’s foreign-born population has swelled from 10 million in 1965 to a record 45 million in 2015. By 2065, the U.S. will have a projected 78 million immigrants.

HispanicSeptember 11, 2015

Number of babies born in U.S. to unauthorized immigrants declines

About 295,000 babies were born to unauthorized-immigrant parents in 2013, making up 8% of the 3.9 million U.S. births that year. This was down from a peak of 370,000 in 2007.

HispanicAugust 24, 2015

What Americans want to do about illegal immigration

There is little support overall for an effort to deport all those in the U.S. illegally, but past surveys have found support for building a barrier along the Mexican border and for banning birthright citizenship.