Trying to tie up loose ends of his foreign policy agenda, President Barack Obama on Saturday instead found world leaders more focused on someone else: President-elect Donald Trump. Global hand-wringing over America’s next president has taken much of the wind out of Obama's final overseas trip. Adopting an altruistic tone, Obama has offered frequent reassurances that the U.S. won’t renege on its commitments. Yet he’s been at a loss to quell concerns fully, given new signals from Trump that he intends to govern much the way he campaigned. Obama’s visit to Peru, the last stop on his trip, has brought...