What would have to happen for 70,000-ton super-battleships to be built after the Second World War?
Short answerYamato would need a major victory over carriers that convinced navies battleships were necessary to protect carrier groups.
NotesThe counterfactual requires Yamato or Musashi to surprise and destroy early Essex-class carriers and their escorts. Such a result would suggest carrier groups were not safe without heavy-gun protection. The United States would likely complete the Montanas and all Iowas, while Britain would finish the Lions.