Will a navy ever again reach the scale of the Royal Navy or U.S. Navy at the end of the Second World War?
Short answerYes, if another war created the need for fleets that large.
NotesFleets on the scale of those at the end of the Second World War remain possible if another war creates the demand. Economic interdependence does not guarantee peace, and states cannot assume they will only fight wars they choose. A major threat could again require much larger naval forces. The possibility depends on the demands of war.