The OP is NOT handwaving the First World War. Sorry guys.
The Royal Navy is emerging in 1920 with a navy that is over-aged, worn-out, and facing mass obsolescence both for their pre-dreadnoughts (why is anyone even counting them?) and their pre-15" gunned pre-Jutland designed BBs.
The USN has serious cruiser and DD/DDE issues, but those can be addressed much more quickly than with capital ships.
The Royal Navy didn't lead the world in all forms of naval innovation either as cafeteria messing and enclosed bridges weren't introduced until the 50 Lend-Lease destroyers.
But they sure were superior in their much more reliable weapons systems/torpedoes.
USN policy had been to build fewer BBs while concentrating on R&D, which paid off until the SD BBs & Lex BCs, both of which had serious design issues. Whether they could have been addressed in the dockyards or not (I doubt it) I'll leave to the expertise of
HMS Warspite.
OTL the combination of financial exhaustion in the UK and war weariness overall made the WNT a godsend for the UK.
One can argue, correctly IMO, that the initial post-WWI DNs of the RN were
marginally superior to the USN's, but that slight margin won't matter to the numbers of newer fresher USN DNs. [0] Then consider the American concentration on aircraft carriers [1] as opposed to the mess created by the Air Ministry's preventing the FAA from developing a truly first class naval air force.
Astrodragon, where are you?
[0] OTOH, British destroyer flotillas ITTL could be devestating to the US Battleline.
1] One might well see more Lexingtons/Saratoga's ITTL!