beef up border security and expell all foreign nationals except those going through naturalisation processes.
if this is done, it is extremely unlikely we should be attacked again, unless by military forces with access to airplanes, large artillery, missiles, etc.
With current methods and technology this simply would not work. It is well understood that a foreign country can not simply send some planes or boats to the US mainland to drop bombs. It's clear that wouldn't have a snowball's chance in hell of working. Why do you think 9/11 worked? Because it was our own planes.
Look at our shipping industry. It is physically impossible to give every box and container a full examination. That's where things would come in.
As for illegal aliens, well, I don't know what to tell you. Border control would only prevent those who haven't gotten in yet. It would do nothing against those who are already here. Plus, we have people here who already have citizenship that would be more than happy to assist in an attack. It's not such a simple enemy to find.
Additionally, after 40+ years of two superpowers aiming weapons at each other and many egomaniac leaders standing by the button, the fact that it never happened says something to me. Everyone wants to be the main player, but if you're the main player of a destroyed world, what do you have?




