Ellis Island begins processing immigrants into the United States.

Ellis Island is an island in New York Harbor, within the U.S. states of New Jersey and New York. Owned by the U.S. government, Ellis Island was once the busiest immigrant inspection and processing station in the United States. From 1892 to 1954, nearly 12 million immigrants arriving at the Port of New York and New Jersey were processed there; approximately 40% of Americans may be descended from these immigrants. It has been part of the Statue of Liberty National Monument since 1965 and is accessible to the public only by ferry. The north side of the island is a national museum of immigration, while the south side of the island, including the Ellis Island Immigrant Hospital, is open to the public through guided tours.

Immigration has been a major source of population growth and cultural change in the United States throughout much of its history. As of January 2025, the United States has the largest immigrant population in the world in absolute terms, with 53.3 million foreign-born residents, representing 15.8% of the total U.S. population—both record highs. While the United States represented about 4% of the total global population in 2024, 17% of all international migrants resided in the United States. In March 2025, the Federation for American Immigration Reform (FAIR) estimated that approximately 18.6 million illegal immigrants resided in the United States. In 2024, immigrants and their U.S.-born children number more than 93 million people, or 28% of the total U.S. population.

January 1 is the first day of the calendar year in the Gregorian Calendar; 364 days remain until the end of the year. This day is also known as New Year's Day since the day marks the beginning of the year.