American foreign policy is at a crossroads. The nation is fiscally challenged, politically polarized, frustrated by 10 years of conflict, and confronting relative decline—a daunting set of conditions in which to establish a foreign affairs agenda. Successfully...

After a dozen years of war, the 2008 financial crisis, budgetary contraction inside government, and growing political polarization, U.S. security policy stands at a crossroads as America finds itself lacking a durable political consensus on the nation’s role in the...