The Great War, which America entered a century ago this month, offers lessons for us today on democracy, trade, and arms races.

Trump appeared to revel in chaos on the campaign trail, but chaos theory does not hold when it comes to foreign policy. Consider some of the consequences—and these are the shortest of short-term consequences—of Trump’s early foreign policy decisions and pronouncements.

As history reminds us, the security payoffs of a “Fortress America” approach are ephemeral and fleeting. Both the national interest and international security suffer when America turns inward.