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.

HispanicMay 4, 2016

U.S. border apprehensions of families and unaccompanied children jump dramatically

Apprehensions of children and their families at the U.S.-Mexico border since October 2015 have more than doubled from a year ago and now outnumber apprehensions of unaccompanied children, a figure that also increased this year.

U.S. PoliticsApril 15, 2016

Americans’ views of immigrants marked by widening partisan, generational divides

Between 1994 and 2005, Republicans’ and Democrats’ views of immigrants tracked one another closely. Beginning around 2006, however, they began to diverge.

HispanicApril 14, 2016

Apprehensions of Mexican migrants at U.S. borders reach near-historic low

This change comes after a period in which net migration of Mexicans to the U.S. had fallen to lows not seen since the 1940s.

April 8, 2016

From multiracial children to gender identity, what some demographers are studying now

The nation’s largest annual demography conference, the Population Association of America meeting, featured new research on topics including couples who live in separate homes, children of multiracial couples, transgender Americans, immigration law enforcement and how climate change affects migration.

GlobalMarch 18, 2016

Illegal migration to EU rises for routes both well-worn and less-traveled

In 2015, more than 1.8 million people crossed the European Union’s borders illegally, up from 280,000 detections of illegal border crossings in 2014.

GlobalFebruary 11, 2016

5 facts about Mexico and immigration to the U.S.

From 1965 to 2015, more than 16 million Mexicans migrated to the U.S. in one of the largest mass migrations in modern history. But Mexican migration to the U.S. has slowed in recent years. Today, Mexico also increasingly serves as a land bridge for Central American immigrants traveling to the U.S.

HispanicFebruary 3, 2016

Homeland Security produces first estimate of foreign visitors to U.S. who overstay deadline to leave

Out of 45 million U.S. arrivals by air and sea whose tourist or business visas expired in fiscal 2015, the agency estimates that about 416,500 people were still in the country this year.

HispanicJanuary 19, 2016

Key facts about immigrants eligible for deportation relief under Obama’s expanded executive actions

The U.S. Supreme Court is expected in April to hear a lawsuit by Texas and 25 other states that seeks to block presidential executive actions offering deportation relief and work permits to unauthorized immigrants.

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.