Foreign policy was the last thing on voters' minds in the midterm elections, but as we begin 2019, one thing is clear: President Donald Trump's "America First" foreign policy — or its progressive cousin, retrenchment — is broadly popular in both parties. Trump's recent decision to withdraw all U.S. troops from Syria and 7,000 from Afghanistan has been condemned by Democrats and Republicans alike in Washington, D.C. But it is not at all clear that Americans beyond the Beltway are equally outraged.
The fact is, whatever tolerance most Americans had for the global role the United States embraced after World War II began to fade with the collapse of the Soviet Union and was shattered by the wars in Iraq and Afghanistan and the 2008 financial crisis. Whoever takes office in 2020 will have a hard time bucking a trend that preceded Trump and will likely survive him.
Yet that president is going to face an increasingly dangerous world that looks more like the 1930s than the end of history — with populists, nationalists and demagogues on the rise; autocratic powers growing in strength and increasingly aggressive; Europe mired in division and self-doubt; and democracy under siege and vulnerable to foreign manipulation. Then there are the new challenges of our own century — from cyberwarfare to mass migration to a warming planet — that no one nation can meet alone and no wall can contain.
Doubling down on "America First," with its mix of nationalism, unilateralism and xenophobia, will only exacerbate these problems. But so would embracing the alternative offered by thinkers across the ideological spectrum who, concerned that our reach exceeds our means, advise us to pull back without considering the likely consequences, as we did in the 1930s.
Back then, the result was an even greater global conflagration. But after World War II, when Americans stayed engaged, built strong alliances with fellow democracies and shaped the rules, norms and institutions for relations among nations, we produced unprecedented global prosperity, democracy and security from which Americans benefited more than anyone. It wasn't a perfect world, but it was far better than the alternative.
So here is the challenge: Can we find a foreign policy of responsible global engagement that most Americans support, that draws the right lessons from our past mistakes, that steers between the equally dangerous shoals of confrontation and abdication and that understands the difference between self-interest and selfishness? Such a policy would rest on four pillars:
1. Preventive diplomacy and deterrence
A responsible foreign policy seeks to prevent crises or contain them before they spiral out of control. That requires a combination of active diplomacy and military deterrence.