Were Lexington and Saratoga converted from battlecruisers, and what did that imply?
Short answerYes. Both began as battlecruisers, and the planned class reused names including Constitution and United States.
NotesLexington and Saratoga began as battlecruisers whose hulls were already laid down. The planned class included ships named Constitution and United States. Reusing Constitution for a new battlecruiser affected the name of the older frigate. She was temporarily called Old Constitution while the new ship was planned.