Since Donald Trump took office, the growth of North Korea’s nuclear arsenal and the increasing capability and diversity of its ballistic missile force have made that country the most urgent threat to . national security. Observers as diverse as Mark Bowden in the Atlantic, Michael Auslin of the Hoover Institution, and former White House chief strategist Steve Bannon agree that all military options available to the president are bad. How exactly did we get to this point? What policy decisions led to an emerging intercontinental ballistic missile capability and a nuclear arsenal that could rival that of the .