For many Americans, the attacks on Brussels must have felt like more of the same. Once again, militants struck, the systems designed to stop them failed and all the blood and treasure of 15 years of "war on terror" appears more wasted than ever.
From an outsider's perspective, though, the way in which the United States reacts appears to be subtly shifting. Almost without noticing, America is beginning to dramatically rethink the way in which it interacts with the world.
As with so many things, Donald Trump is the clearest manifestation of the trend. For all his talk of "making America great again," the foreign policy he has begun to outline — particularly in interviews with senior editors at The New York Times and The Washington Post — smacks of outright isolationism.