We all live in the community that is this world, and in the last 50 years so much has changed.
Countries that where at one time no threat to the rest of the world (except to themselves with suicide bombers) are now able to communicate, plot and execute terrorist acts such as 9.11 with aids like the internet and world airlines flying to every destination.
The world we now live in is the most precarious time there has ever been.
Many Countries and people have had to live with the threat of terrorism for Decades even a Centaury or more, America is perhaps now more under threat because the big water that has separated it from such attacks isn't quite so big anymore.
You have many reasons to be afraid Kagom. There everywhere.... And I'm one of them... So be afraid!
You should be like one of the iditiots in the fifties who thought they could survive a hydrogen bomb falling on them, if they built a basement. Sure, they called it a bomb shelter, but how effective would they actually have been if we were attacked?
Well anyway, go dig your shelter and stock up for WWIII. The World vs. USA.