Unauthorized Immigration/Irregular Migration

Explore all research, analysis, commentary, and data on unauthorized immigrants and irregular migrants, terms used in different parts of the world to describe the individuals who lack the right to reside legally in their country of destination, as well as the policies and enforcement practices affecting them.

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As Europe and the United States Face Similar Migration Challenges, Spain Can Act as a Bridge

Spain and the United States both receive their greatest number of immigrants from Latin America, and have worked collaboratively together on displacement crises and other migration issues. As shared immigration challenges dominate debate on both sides of the Atlantic, Spain can serve as a vital bridge in the policy conversation, this commentary notes.

Image of female worker at the Boqueria market in Barcelona making a crepe

European Immigrants in the United States

Once the leading source of immigrants to the United States, Europeans made up just 10 percent of U.S. immigrants in 2022. War in Ukraine pushed more Ukrainians to the United States.

A celebration for the Feast of San Gennaro in New York's Little Italy