If the United States supplied Baltimore-class cruisers, how difficult would they have been for Britain to maintain?
Short answerProbably not very difficult, provided the transfer included spare parts and the specialized machinery needed to make replacements.
NotesThe Royal Navy already operated County-class cruisers and continued building Dido- and Crown Colony-class ships despite bombing and wartime strain. That record demonstrates an active technical and industrial base capable of operating complex cruisers. The main obstacle for Baltimore-class ships would have been the foreign supply chain rather than a lack of British competence. American spare parts and the machinery needed to reproduce them would probably have made British maintenance manageable.