Which naval innovations and ship types would be skipped if war began in 1920 instead of 1914?
Short answerRenown- and Admiral-style wartime battlecruisers likely disappear, fast battleships dominate, and purpose-built carriers make turret-launched aircraft less relevant.
NotesThe emergency conditions that produced lightly protected 15-inch battlecruisers no longer exist, so the Royal Navy's next capital ships follow the fast-battleship path. Aircraft still go to sea, but a carrier program likely matures before the temporary expedient of flying aircraft from battleship gun turrets becomes operational practice.