U.S. Citizenship and Immigration Services INS - provides information to introduce you to U.S. Citizenship and Immigration Services (USCIS) within the Department of Homeland Security (DHS).
https://www.uscis.gov/
Immigration and Customs Enforcement - Combining the law enforcement arms of the former Immigration and Naturalization Service (INS) and the former U.S. Customs Service.
https://www.ice.gov/
The Bureau of Consular Affairs - US Department of States - The Bureau of Consular Affairs.
https://travel.state.gov/content/travel.html
