The latest Pew Research Center data estimates there were 10.5 million unauthorized immigrants living in the U.S. in 2017, down significantly from a decade prior. In this video, our researchers go behind the scenes to explain the “how” and “why” behind determining these new numbers.

Correction (June 24, 2019): A previous version of the chart “Mexicans are no longer the majority” gave an incorrect number of unauthorized immigrants from countries other than Mexico in 1990. There were 1.5 million.