What are the chances of an American being killed by a terrorists on American soil? Good question, if you break it down to the numbers, you're talking the typical American has a 1-in-3,600,000,000 (that's billion) chance of being killed by a non-American, and that's factoring in the 9/11 deaths.
I don't know how you feel about those odds, but here are a few things to compare that to for scale...
1 in 13,983,816: Odds of winning a state lottery.
1 in 960,000: Odds of being hit by lightening.
1 in 619: Odds of catching a foul ball at a Major League baseball game.
1 in 10,000: Odds of finding a four-leaf clover.
1 in 606: Lifetime odds of dying in a car accident.
3.6 per 1,000: Number of divorced Americans per individual.