What happens if the modern US Navy and all its support industry are sent back to 1912?
Short answerIt creates an overwhelming technological lead, but the United States still has to finance the fleet and sustain its industrial and taxation base while other powers race to learn from it.
NotesThe ships would immediately overmatch contemporary navies and trigger a global technology race. Their advantage would also reveal how much advanced warships depend on infrastructure ashore. Nuclear carriers, sensors, aircraft, and weapons require specialised maintenance and replacement parts. Sustaining that industrial ecosystem would be the real constraint for a 1912 state.