For the first time in U.S. history, immigration was the sole factor behind the country’s population growth in a single year, according to a study released Wednesday by the Migration Policy Institute.

Based on U.S. Census Bureau data from 2022-2023, the MPI report attributes this shift to declining birth rates among American-born residents.

The U.S. population grew solely due to immigration between 2022 and 2023, marking a historic first, according to the MPI’s analysis of census data. The study found that the U.S. immigrant population increased by 1.6 million, reaching a record 47.8 million people, or 14.3% of the total population.

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