Let's stop the fallacy that "the world (somehow) changed" on that date.
See President John F. Kennedy speaking about terrorism before the UN General Assembly on September 25, 1961. http://www.youtube.com/watch?v=0rpG2ZM1vi0
(Copyright - John F. Kennedy Library Foundation)
(Copyright - John F. Kennedy Library Foundation)
Unfortunately, as any student of history can tell you, our reactions to it haven't changed much either.
For further comparison/contrast:
An excerpt from President John F. Kennedy's commencement address at American University on June 10, 1963.
(Copyright: Kennedy Library Foundation)
(Copyright: Kennedy Library Foundation)


Salon.com
Comments
the terrorists saw that people were paralzyed by it
if you hold a cave in Pakistan next to your ear, you can hear giggling.