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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Jimmy Carter and Immigration: A Wide-Ranging Legacy That Remains Relevant Today

The passing of the nation’s 39th president has sparked numerous assessments of the Carter presidency, yet few have focused on the wide-ranging legacy that Jimmy Carter left in the immigration realm. The Carter presidency illustrates the long history of authorities that remain in use today, including parole and creation of lawful pathways to admit people in orderly ways, and the persistent roots of issues such as spontaneous migration from the Caribbean.  

President Jimmy Carter at podium

The Biden Legacy on Immigration: A Complex Picture

What was the Biden record on border management, legal immigration, refugee resettlement, and other immigration aspects? Speakers assessed the Biden legacy and discussed MPI's analysis of the administration’s actions on immigration.

President Biden speaks at state of the union

Legal Pathways and Enforcement: What the U.S. Safe Mobility Strategy Can Teach Europe about Migration Management

The Biden administration's ambitious migration management strategy, which combined increased regional cooperation and expanded lawful pathways with a more orderly system for border arrivals, eventually led to a significant drop in irregular migration to the U.S.-Mexico border. The strategy holds promise for governments in Europe also tackling mixed migration flows—however sequencing matters, among other lessons.

Migrants and community members at a local clinic in Panama

Inmigrantes mexicanos en Estados Unidos

Los mexicanos siguen siendo el grupo de inmigrantes más numeroso de Estados Unidos, pero su población lleva más de una década disminuyendo.

Una carroza decorada con la bandera mexicana en un desfile en Fort Worth, Texas.

Immigrants and Crime in the United States

A significant and growing body of research at U.S., state, and local levels demonstrates that immigrants commit crimes at lower rates than the U.S.-born population.

A judge's gavel with multicolor background