US immigration trends under enforcement policies

In late July 2026, data showed a drop in the United States’ foreign‑born population, with the number of migrants falling for the first time in decades. Analysts linked the decline to an aggressive anti‑undocumented‑migration strategy that intensified ICE detentions and deportations, prompting even legally present residents to leave voluntarily.

A few days later, a separate estimate indicated that the undocumented immigrant population had risen to about 15.8 million nationwide, including roughly 920,000 in New York City. The increase was attributed to record unauthorized border arrivals and the use of humanitarian parole programs under the Biden administration, while overall net international migration continued to slow.

Together, the snapshots illustrate a complex picture: overall migrant numbers are decreasing, yet the undocumented segment is growing, reflecting the mixed impact of enforcement actions and policy choices on U.S. immigration flows.