Strong global leadership has been a pillar of US foreign policy for more than half a century, but some believe the Trump administration’s America First agenda strays from the country’s enduring tradition of international engagement. But disengagement in the Middle East and an empty “pivot to Asia” in the Obama administration also signaled a similar drift from internationalism. For years, public support of the nation’s visible role in the world was a given, but is there a more fundamental shift in American thinking?