Maybe you are in the habit of applying a hefty discount to claims by Donald Trump; no one could blame you. But he really does have the chance to lead America into the golden age he proclaimed in his second inaugural address. Historic circumstances, political dynamics and his own audacity could also enable him to achieve the legacy he wants as “a peacemaker and a unifier”. His party has fallen into lockstep; his adversaries at home are confounded and enervated, and America’s opponents abroad are preoccupied with their own troubles. Mr Trump has battled for ten years against anyone he perceived to have crossed him. His most formidable adversary still standing is probably himself.