The 1920s and 1930s were a period when the US Navy was still deciding what cruisers were for. The transitional-looking Omaha class contrasts with the more coherent Brooklyn and Baltimore classes. Within roughly two decades, cruisers moved from absence in the principal fleet formations to essential roles in both the battle and scouting forces. The change makes cruiser design an institutional and doctrinal story as much as a technical one, with fleet structure, missions, and ship design developing together.
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The US Navy's interwar cruiser transformation
The opening traces the US Navy's shift from the Omaha class and fleet formations without cruisers to the Brooklyn and Baltimore era.