The Department of Homeland Security is tasked with securing the nation from threats, and to that end has more than 20 departments under it. Many of these offices were moved from beneath other departments. Among these are FEMA the Office of Cybersecurity & Communications, Immigration & Customs Enforcement, Secret Service, and the Coast Guard.
 
 
Recommended Resources
The On Guard Online website, published by the American government, is a resource to help people protect themselves against Internet fraud and crime. The game also has videos to make it easier to learn about online safety. You can also find expert advice here on how to protect yourself online.
http://www.onguardonline.gov
Transportation Security Administration
The Transportation Security Administration is an agency of the US government concerned with monitoring and improving transport security. Travelers can find information on how to stay safe while in transit. You can also find reports of the administration's activities here.
http://www.tsa.gov/
U.S. Citizenship and Immigration Services
Introduces information about visiting the USA temporarily, or making a more permanent move to the country. Also offers preparation for the Naturalized Citizen test.
http://www.uscis.gov/
U.S. Customs and Border Protection
Official US government service on customs and border protection. Provides access to customs forms and electronic travel authorization services for Visa Waiver Program countries.
http://www.cbp.gov