I suppose some Americans don’t care about foreign policy until a threat reaches our shores. They should care, because the actions we take abroad—or don’t take—determine whether the United States is safe in the long run. Our friends are among the best stockades against foreign hostility. We’re talking about countries that come to our aid when disaster strikes; that stand up for us in contentious international disputes; that protect our ships, planes, and people; and that are willing to fight and die alongside our troops in remote deserts.