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A lot of attention is being paid to the risk to US citizens from terrorist attacks, particularly terrorist attacks perpetrated by refugees from abroad.

According to a Cato Institute report that used data from 1975 to 2016, "the chance of an American
perishing in a terrorist attack on U.S. soil that was committed by [any] foreigner over the 41-year period studied here [was] 1 in 3.6 million per year." If the perpetrator category is restricted to refugees, the odds are 1 in 3.64 BILLION per year.  If the perpetrator category is restricted to illegal immigrants, the odds become 1 in 10.9 billion.

To help put this into perspective, here are some additional data for comparison:

Odds of dying from:
Being pushed in front of a subway train: 1 in 2,211,000,000
Being crushed by a meteorite: 1 in 700,000
Lightning strike: 1 in 174,426
(Odds of merely being struck by lightning are 1 in 12,000 in a lifetime)
Legal execution: 1 in 111,439
Air and space transport incidents:1 in 9737

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