Americans have been living in a country that has not known peace since 9/11, when President George W. Bush and his posse of neoconservatives delivered the message to the world that "you are either with us or against us." The threat was coupled with flurry of hastily conceived legislation that opened the door to the unconstitutional "war on terror" carried out at the whim of the Chief Executive, a conflict which was from the start conceived of as a global military engagement without end.
Bush and his handlers might not have realized it at the time but they were initiating a completely new type of warfare. To be sure, there would be fighting on the ground worldwide against an ideologically driven enemy somewhat reminiscent of communism, but there would also be included "regime change" of governments in countries that were not completely on board with the direction coming out of Washington. Instead of invading and occupying a country in the old-fashioned way, so the thinking went, far better to just knock off the top levels and let the natives sort things out while acting under direction from the pros in Washington.
Even though "regime change" in Iraq and Afghanistan did not work out very well, Bush saw himself as a triumphant war leader with his vainglorious "Mission Accomplished," and he later dubbed himself the "decider." He insisted that his reelection in 2004 when running against a weak John Kerry was a validation of his policies by the American people, but one has to wonder how many voters really understood that they were signing on for perpetual war that would of necessity also diminish their most cherished liberties.
Nobel Peace Prize winner and U.S. President Barack Obama followed Bush and made it clear that there would be no stepping back from a policy of proactively "protecting" the American people. Obama and his Secretary of State Hillary Clinton destroyed Libya, a disaster that is still playing out, increased involvement in Syria, and introduced death by drone for both American citizens who have transgressed and random foreigners who fit a profile. And to eliminate any pushback to what he was doing, Obama relied on invoking the state secrets privilege to block legal challenges more times than all his predecessors in office combined.
And now we have President Donald Trump, whose foreign policy is particularly unarticulated, though in many ways similar to that of his predecessors. The United States is increasing its involvement in Afghanistan, where it has been engaged for longer than in any previous war, is threatening both Iran and North Korea with annihilation, and is hopelessly entangled in Trump's pledge to completely eliminate ISIS. Indeed, destroying ISIS (and al-Qaeda) has been the one clearly articulated part of the Trump foreign policy, though there are also occasional assertions that it should be accompanied by yet one more try at regime change in Damascus.