Former President Joe Biden’s open border immigration crisis led to an “extraordinary” surge in legal and illegal migrants into the United States and new population highs in 31 states and the District of Columbia.

According to census data, the growth cemented the long-changing migration trend from the East to the South, which has seen a 578% increase in the foreign-born population.

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During Biden’s four years, California added 1.4 million migrants and Texas 1 million, but several other states shared in the burden of having a huge influx arrive to compete for jobs and taxpayer-funded social services, according to an analysis of the data by the Center for Immigration Studies.

Under Biden, millions of migrants came to America, mostly illegally. “Illegal immigrants accounted for 5.4 million or two-thirds of the 8.3 million growth in the foreign-born population,” said the center in an earlier report on the overall numbers.

The think tank said the surge has been a decadeslong event. “The increases at the sub-national level in many parts of the country in the last 45 years can only be described as extraordinary,” it said.

It used that word again when it revealed where new illegal and legal migrants are landing: “The South now has the largest immigrant population. The increase has been extraordinary,” said the report, which focused on where Biden-era border crossers ended up.

“The border surge contributed to very large increases in the number of immigrants in just the last four years in many states,” the report continued. “From the first quarter of 2021 to the first quarter of 2025 the foreign-born population grew by more than one-third in 16 states.”

In dishing numbers, it added, “Numerically the largest increases in the foreign-born population from 2021 to 2025 were in California, up 1.4 million; Texas, up one million; Florida, up 828,000; Pennsylvania, up 433,000; Georgia, up 413,000; Maryland, up 396,000; Indiana, up 339,000; Massachusetts, up 327,000; and Washington, up 311,000.”

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And, it said, “In the first quarter of 2025, the foreign-born share of the population hit historic highs in 14 states: Alabama, Delaware, Florida, Georgia, Indiana, Maryland, Mississippi, New Mexico, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, and Virginia. Numerically, the foreign-born population hit record highs in 31 states plus the District of Columbia.”

“Our analysis of the size of the growth of the foreign-born population across the country shows that it has become a truly national issue in a way that was not the case four and a half decades ago,” the report concluded. “This is likely to be true for the foreseeable future.”