But the nature of terrorism is that is those within who do the damage. It may be that most of the 9/11 perps were from Saudi Arabia, but they were living here. Nuking S.A. might help in the long run (especially the vivid example of the utter destruction of the Kabbla) but still you have all these Islamic societies and stuff here.
I think it would be interesting. I see three scenarios possible. One is the government acts quickly and deports hundreds of thousands of Arabs, and perhaps other illegals along with them. The second, and more likely is that they do not, and continue to mouth "religion of peace" nonsense as the death toll continues to rise. This could lead to vigilante justice where loosely organized mobs simply destroy every Moslem person and edifice in the country (imagine the fall out from a successful suitcase nuke detonation in mid-town Manhattan with millions dead). Of course many innocent will die in this. The government would again have to choose to either focus on the terrorist supporting communities or the vigilantes and this could, if mis-handled lead to full on Civil War as large segments of the population become unruly and unwilling to listen to the PC gibberish flowing from the senators from New York, Mass, Cali and other liberal hell holes. It could, easily, get regional. And with that, I'll ping Archy!
Inner city America? That's where the future of terrorism in America lies. Nukes probably wouldn't be a real popular solution for this, but I'm sure it would get some support.