Yes, it is... and some would argue that it's already gone through the front door.
I have long told people that if they want to see a precursor to "things that may come to America," look towards Israel.
Setting that boiling pot aside for a moment, there is the cauldron in Latin America and the Carribean Basin to keep in mind.
Then there's the "Jihad! Across the World" with tentacles all over the place- Malaysia, the Philippines, elsewhere.
If you want to get really paranoid, there's always Red China and North Korea to consider for future mischief... and heck! Even the IRA is stirring the pot!
On an intellectual level, it's a darkly fascinating time to be present and alive... of course, on a practical level it's fraught with peril.