American planners wanted more than parity with Japan alone. Their model needed enough ships to overmatch Japan in the Pacific while retaining a reserve if relations with Britain somehow deteriorated. A reduced treaty ratio could provoke opposite domestic responses: isolationists might argue that weakness required avoiding foreign commitments, while naval advocates could demand rearmament. Fleet ratios fed directly into two-ocean planning and domestic politics rather than serving as abstract prestige numbers.
Notable Point · 59:44-1:01:11
Why US planners wanted a two-ocean naval margin
American treaty requirements combined a Pacific margin over Japan with a residual force against an unlikely British crisis.