The industrial problem behind Japanese cruiser compromises

Japan recognised its industrial constraints in the 1920s, yet did not consistently invest in the yards, fuel supply, and armaments capacity required for a larger war. Synthetic oil from coal was an especially obvious field for a state that knew imported petroleum would be a wartime vulnerability. The Army and Navy instead spent resources on parallel factories and institutions designed to keep their programmes separate. Both services understood many of the same structural problems but failed to coordinate solutions. That failure meant treaty withdrawal could not suddenly produce the fleet imagined by the victorious Fleet Faction. Industrial preparation and interservice politics are therefore essential to judging whether the cruisers justified their cost.