Where did immigrants enter the United States between 1866 and 1915?

Between 1866 and 1915, the primary entry point for immigrants into the United States was Ellis Island in New York Harbor. Opened in 1892, Ellis Island processed millions of newcomers, becoming a symbol of the immigrant experience. Additionally, other entry points included Angel Island in San Francisco, which primarily served Asian immigrants, and various ports along the East and West coasts. These locations served as gateways for diverse groups seeking better opportunities in America.