10 Biggest Security Failures in American History

VOICE OVER: Phoebe de Jeu
WRITTEN BY: Nick Spake

How did they miss these? Welcome to WatchMojo, and today we're looking at the most shocking moments in American history that left the world questioning just how secure the country is. Our countdown of the biggest security failures in American history includes The Assassination of John F. Kennedy, The Attempted Assassination of Donald Trump, the Attack on Pearl Harbor, and more!

  • #11: Jonathan James' NASA Hack (1999)
  • #10: The Attempted Assassination of Ronald Reagan (1981)
  • #9: National Security Agency Breach (2013)
  • #8: The Attempted Assassination(s) of Gerald Ford (1975)
  • #7: Las Vegas Mass Shooting (2017)
  • #6: The Attempted Assassination of Donald Trump (2024)
  • #5: January 6 Capitol Attack (2021)
  • #4: The Assassination of John F. Kennedy (1963)
  • #3: Attack on Pearl Harbor (1941)
  • #2: September 11 Attacks (2001)

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