General

• Angel Island Immigration Station Foundation
• Angel Island State Park
• Angel Island Immigrant Journeys of Chinese-Americans: An Oral History of Chinese Immigrant Detainees
• Ellis Island: Through America's Gateway 
• Ellis Island Home Page
• The History Channel: Ellis Island
• Lower East Side Tenement Museum

Primary Sources

• The Foreign Immigrant in New York City

Illegal Immigration

• Illegal Immigration and U.S. Border Security

African Americans

• Chinese Exclusion Act: Text of Act
• Chinese Immigration
• Japanese Immigration

European Americans

• German Immigration
• Germans in America
• Irish Immigration
• Italian Immigration
• Polish Immigration
• Russian Immigration
• Scandinavian Immigration

Hispanic Americans

• Mexican Immigration