International is a serious , one that most leaders and citizens agree needs to be taken seriously. However, when the risk is boiled down to a matter of , refugees, and American citizens, the threat becomes . According to a review by the CATO Institute, the of an in a terrorist attack committed in the US stands at about . The breakdown includes over a and includes the , in which 3,000 people died. Once you narrow it to and and , the threat is .