Why were Alaska-class ships not retained after the war?
Short answerTheir intended opponents no longer existed by the time they entered service, so the strategic requirement behind them had faded.
NotesThe answer distinguishes economic irrelevance from technical impossibility. Alaska-like ships made more sense when an opponent possessed cruisers worth deterring or countering on distant stations. Visible Soviet Sverdlov-type cruisers at the war's end could have preserved that target set and strengthened the case for keeping the Alaskas. By the time the class actually arrived, however, the anticipated targets had gone, changing the strategic case for retaining it.