Admirals, Lexingtons & Tosa; What if the Washington Naval Treaty built them?

The counterfactual starts by showing why keeping all Admirals and Lexingtons forces a different Washington Naval Treaty settlement.

Britain keeps the Admiral-class hulls as bargaining counters and bets that U.S. legislators will not fund the balanced fleet needed to exploit nominal parity.

A Mediterranean, Atlantic, and Indian Ocean structure gives the counterfactual fast capital ships and carriers a plausible peacetime role.

A partly successful First World War torpedo attack on Wilhelmshaven gives Beatty and Sueter evidence that shipborne aviation can strike a fleet in harbor.

A proven carrier-strike role lets Beatty and Jellicoe keep fleet aircraft naval, with long-term effects on organization and engine development.

A revised capital-ship settlement uses heavy battlecruisers and trade protection to keep the arms-control deal politically plausible.

Japan's incentive in the altered settlement is completing Tosa, gaining a prestige battleship without making the treaty collapse.

The altered settlement gives Britain five new 16-inch capital ships, the United States its desired six-gunship total, and Japan a larger share than it received historically.

The carrier side of the counterfactual creates a larger conversion-only strike-carrier category alongside smaller standard carriers.

The U.S. gains a common Lexington machinery pool, but the paired battlecruiser-and-carrier force complicates carrier armament choices.

The Royal Navy's cleanest path is three Admiral-class carriers plus new fast capital ships rather than a mixed one-off carrier fleet.

Shrinking the G3 into a treaty-compliant F3 favors a compact all-forward battery and leaves useful space for secondary and anti-aircraft weapons.

A larger 16-inch construction program could yield faster Nelson-type battleships and a layered force of mobile, deployable, and presence ships.

Completing Tosa gives Japan the world's largest battleship in the early 1920s and a ten-gun symbol of parity despite Anglo-American numerical superiority.

British strike carriers sailing with battlecruisers create an early fast task-force model and could change Fleet Air Arm organization.

With most expendable ships already gone, reducing fleet numbers in 1930 could release enough replacement tonnage to stimulate new fast-capital-ship construction.

Fifteen years of strike-carrier practice distributes British carrier groups across the Atlantic, Mediterranean, and Indian Ocean and makes an early attack on German naval bases plausible.

Routine Lexington carrier-battlecruiser groups drive fast-oiler construction and recast the battlecruiser as a carrier guardian and escort flagship.

A large carrier operating with airborne reconnaissance and a battlecruiser escort turns the historical loss of Glorious into a dangerous interception for the Germans.

More large decks and established tandem doctrine make early-war multi-carrier strikes and Anglo-American Pacific task groups more likely.

Building and supporting more large ships sustains design experience, enlarges docks, and changes later modernization and construction choices.

The closing counterfactual asks how leaving Washington with Tosa and a sense of success might alter Japan's carrier program, strike force, and national outlook.