You can also add in American immigration policy as the State Department let the terrorists into the country. But immigration policy is a subset of foreign policy. Right now for whatever reason American policy is not to secure our borders, let anybody into the country that wants to come, promote imports, destroy US manufacturing, and go overseas pissing people off that know how to make bombs. Really, Iran doesn't need and ICBM. They could walk a disassembled nuke across the US/Mexican border. If fact any foreign country could do it. Now if you agree with this foreign policy then fine, but don't complain about the consequences. I however call it insanity.