On September 11, 2001, terrorist attacks in New York City, Washington D.C., and Pennsylvania changed the global community, pushing terrorism into the spotlight, and triggering a series of world events that included the invasion of Afghanistan and the Iraq War. For many people in the United States, it was their first experience of terrorism in their home country.Terrorism is a global phenomenon that affects many people worldwide, yet it is not a new problem terrorism has a long history dating back to ancient societies.

Timeline -- A Day the world will not forget -- Defining Terrorism -- Who are the terrorists? -- Tactics and targets -- Terrorism in the United States -- The fight against terrorism -- The future of Terrorism.