When Donald Trump touched down in Ireland and declared reunification 'fantastic,' he did what few major world figures dare to do openly: he took a side in a question that has shaped a century of identity, conflict, and fragile peace. The partition of Ireland, the Troubles, and the Good Friday Agreement all live in the shadow of that single word. His endorsement, however casually offered, reminded the world that some wounds are never fully closed — and that outside voices, however powerful, can reopen them with a syllable.