Terrorism and National Security in the United States of America

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National Security Defined

National Security is the protection of the United States from attack or other danger by holding satisfactory armed forces and guarding state secrets. National Security in the United States is run by the National Security Agency. 

The National Security Agency 

• Protects U.S. national security systems
• Produces foreign signals intelligence information 
• Utilizes code makers and code breakers
• Holds government-wide responsibilities  

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Terrorism Defined

According to 6 USCS § 101, the term terrorism is "any activity that--

(A) involves an act that--

     (i) is dangerous to human life or potentially destructive of critical infrastructure or key                 resources; and

     (ii) is a violation of the criminal laws of the United States or of any State or other                             subdivision of the United States; and

(B) appears to be intended--

     (i) to intimidate or coerce a civilian population;

     (ii) to influence the policy of a government by intimidation or coercion; or

     (iii) to affect the conduct of a government by mass destruction, assassination, or                               kidnapping."

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https://www.washingtonpost.com/news/wonk/wp/2013/09/11/nine-facts-about-terrorism-in-the-united-states-since-911/
http://uslegal.com/