Enforcement & treatment of unauthorized migrants

Era-typical enforcement. Modest INS activity.

IRCA established employer sanctions and worksite enforcement framework. Border Patrol expansion modest under Reagan compared to subsequent administrations. No mass deportation operations.

Era-typical enforcement. Bracero Program continued.

Bracero Program ended (December 1964). Hart-Celler imposed Western Hemisphere caps for first time, contributing to subsequent undocumented migration patterns.

Era-typical. Operation Wetback was 1954 (Eisenhower); earlier enforcement less aggressive.

Continued IRCA framework. Border Patrol modest expansion. No mass deportation operations.

Era-typical enforcement. Bracero Program ended 1964 (Johnson era) shifted undocumented patterns. Border Patrol expansion modest.

Mariel Boatlift (April-October 1980) overwhelmed response — ~125,000 Cuban arrivals. INS expansion. Era-typical enforcement otherwise.

Title 42 ended May 2023. Continued some Trump enforcement framework. June 2024 EO suspending asylum at border. Continued substantial deportations.

Secure Fence Act 2006 (700 miles of border fencing). Workplace raids expanded. Detention capacity expanded. Post-9/11 securitization framework.

Mexican repatriation of the 1930s (largely state and Hoover-administration-initiated) continued during early FDR years. ~400,000-2 million people of Mexican origin (including US citizens) returned/forced south.

IIRIRA 1996 + Crime Bill 1994 dramatically expanded interior enforcement. Border Patrol doubled. Operation Gatekeeper (1994) hardened San Diego border.

Deported ~2.5 million during term — most of any administration. Family detention. Operation Streamline expansion. Earned 'Deporter-in-Chief' label.

Operation Wetback (1954) — mass deportation operation that removed ~1 million ethnic Mexicans (estimates vary 250K-1.3M, including US citizens). Among the largest deportation operations in US history.

Family separation policy 2017-2018 (~5,500 children separated; some never reunited). Remain in Mexico (MPP). Title 42 expulsions during COVID. ICE detention expansion. Wall construction (~458 miles). Largest immigration enforcement expansion since Operation Wetback.

Trump T2 transferred some migrants from US detention to El Salvador's CECOT facility under inter-government agreements; in the Abrego Garcia matter the Supreme Court directed the administration to facilitate the return of an individual whose removal a federal court had found to violate a prior immigration order. Plaintiffs and several district courts have characterized these transfers as occurring without adequate process; the administration disputes those characterizations. Reporting describes large-scale enforcement operations and the opening of a Florida detention facility informally known as 'Alligator Alcatraz.' Several enforcement matters remain on appeal.