11.   In addition, the nation is preoccupied with no war or great external threat.

12.   In defending the nation from external threats, the requirements of survival cannot merely be finessed.

13.   In people, an external threat reduces the risk of suicide.

14.   It is the natural self-centeredness of a vast continent that faces no immediate external threats.

15.   LOSALAMOS -- When it comes to external threats to the elaborately fenced property, the Los Alamos National Laboratory in northern New Mexico seems prepared, government inspectors say.

16.   Never before has our nation enjoyed so much prosperity and social progress with so little internal crisis or so few external threats.

17.   National unity has also suffered in the recent absence of an external threat.

18.   Never before has our nation enjoyed, at once, so much prosperity and social progress with so few external threats.

19.   Now, if there were an obvious external threat, they could be expected to grit their teeth, buckle down and do what was necessary to protect themselves.

20.   Our concerns now depend critically on an understanding of the extent of the external threat.