1.  A three-step process to get permanent residency
  2. Permanent residence (United States) status [Gren card]
  3. Reside five years a with 30 months physical presence
  4. Apply for Citizenship or Naturalisation

Acts :

  1. Immigration and Nationality Act
  2. The Homeland Security Act (HSA) of 2002
  3. Immigration Reform and Control Act of 1986
  4. Illegal Immigration Reform and Immigrant Responsibility Act of 1996

Department :

  1. US Citizenship and Immigration Service
  2.  U.S. Immigration and Customs Enforcement 
  3.  U.S. Customs and Border Protection