From McClatchy's Warren Strobel, reporting on the State Department's 2009 Country Reports on Terrorism:
There were just 25 U.S. noncombatant fatalities from terrorism worldwide. (The US government definition of terrorism excludes attacks on U.S. military personnel). While we don't have the figures at hand, undoubtedly more American citizens died overseas from traffic accidents or intestinal illnesses than from terrorism.
Make of that what you will.