What historic site serves as the former entry point for millions of immigrants to the United States?

Ellis Island is renowned as the historic site that served as the primary entry point for millions of immigrants to the United States from 1892 to 1954. It is located in New York Harbor and played a crucial role in the immigration process during a time when the United States experienced a significant influx of newcomers seeking a better life.

Over 12 million immigrants are estimated to have passed through Ellis Island, where they underwent medical and legal inspections before being allowed to enter the country. The site today is commemorated as a museum, preserving the history and stories of those who crossed through its halls. This rich history makes it an iconic symbol of America's immigration experience and its ongoing narrative of cultural diversity and opportunity.

In contrast, Liberty Island is known for the Statue of Liberty, which symbolizes freedom and democracy, rather than functioning as an immigration processing center. Governors Island and Roosevelt Island also hold historical significance but do not have the same role in the context of immigration. Thus, Ellis Island stands out as the correct answer due to its pivotal contribution to the immigration history of the United States.